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In 1952–1954, he filed five patent applications for a [[dot matrix teletypewriter]] (aka "teletype writer 7 stylus 35 dot matrix"), later granted in 1957 (see German patent #1,006,007<ref name="DE1006007">{{cite patent |country=DE |number=1006007 |status=patent |title=Umschalteinrichtung für Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind |gdate=1957-09-12 |fdate=1952-07-29 |pridate=1952-07-29 |inventor=Preikschat, Fritz Karl|assign=[[Telefonbau und Normalzeit G.m.b.H.]]}}</ref><ref name="DE1006007B">{{cite patent |country=DE |number=1006007B<!-- DE1952P0015749 --> |status=application |title=Umschalteinrichtung fuer Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind |pubdate=1957-04-11 |fdate=1952-07-29 |pridate=1952-07-29 |inventor=Preikschat, Fritz Karl <!-- |inventor-link=Fritz Karl Preikschat --> |assign=Preikschat, Fritz Karl |url=https://patents.google.com/patent/DE1006007B}}</ref><ref name="TuN_1957"/>). In April 1953, he was hired by [[Telefonbau und Normalzeit GmbH]] ([[TuN]], later called [[Tenovis]]). In 1956, TuN introduced the device to the [[Deutsche Bundespost]] (German Post Office), which did not show interest.<ref name="Preikschat_1989"/> In his final contract with TuN (dated May 31, 1957), he sold the five patent applications to TuN for 12,000 [[Deutsche Mark]]s and 50% of the device's net future profits (while retaining rights for the U.S. market).<ref name="TuN_1957">{{citation |title=Letter of TELEFONBAU and NORMALZEIT G.M.B.H. to Mr. Fritz Preikschat |author1=Telefonbau und Normalzeit GmbH |author-link1=Telefonbau und Normalzeit GmbH |author-first2=Fritz Karl |author-last2=Preikschat |author-link2=Fritz Karl Preikschat |language=German, English |type=Contract |date=1957-05-31 |location=Frankfurt am Main, Germany |url=https://en.wikipedia.org/wiki/File:Telefonbau_und_Normalzeit,_Fritz_Preikschat_1957_contract.pdf |access-date=2016-10-29 |url-status=live |archive-url=https://web.archive.org/web/20161029200707/https://upload.wikimedia.org/wikipedia/en/4/45/Telefonbau_und_Normalzeit%2C_Fritz_Preikschat_1957_contract.pdf |archive-date=2016-10-29 |quote=[…] 1) Patent 8101 Klasse 21a1, Gruppe 17, Anmeldetag: 29.7.1952, ''Fernschreiber [Teletypewriter]''; 2) Patent 15749 Klasse 21a1, Gruppe 7/01, Anmeldetag: 29.7.1952, ''Umschalteinrichtung für Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind [Coding equipment for a Teletypewriter at which characters are consisting of dots (RASTER – points)]''; 3) Patent 15759 Klasse 21a1, Anmeldetag: 29.7.1952, ''Schreibkopf für Raster-Fernschreibmaschine [Recording head for Matrix type (RASTER) Teletypewriter]''; 4) Patent 9043 Klasse 21a1, Anmeldetag 17.1.1953, ''Fernschreiber [Teletypewriter]''; 5) Patent 12196 Klasse 21a1, Anmeldetag 24.6.1954, ''Schreibkopf für Fernschreibmaschine [Recorder for Teletypewriter]'' […]}} (8 pages)</ref> Photos and working papers of the dot matrix teletypewriter prototype were submitted to his first U.S. employer, [[General Mills]], in 1957.<ref name="General-Mills_1957">{{citation |title=Dot matrix teletypewriter prototype photos for General Mills |orig-year=1957 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/9/95/Dot_matrix_teletypewriter_prototype_photos_for_General_Mills%2C_1957.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121055/https://upload.wikimedia.org/wikipedia/en/9/95/Dot_matrix_teletypewriter_prototype_photos_for_General_Mills%2C_1957.pdf |archive-date=2016-10-31}}</ref> A set of working papers for the dot matrix teletypewriter were published in 1961.<ref name="Working-paper_1961">{{citation |author-first=Fritz Karl |author-last=Preikschat |author-link=Fritz Karl Preikschat |title=Working papers on dot matrix teletypewriter |orig-year=1961 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/f/f6/Working_papers_on_dot_matrix_teletypewriter%2C_1961.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121145/https://upload.wikimedia.org/wikipedia/en/f/f6/Working_papers_on_dot_matrix_teletypewriter%2C_1961.pdf |archive-date=2016-10-31}}</ref> At [[Boeing]] in 1966–1967, the dot matrix teletypewriter design was the basis for a portable [[fax|facsimile]] machine (using dot matrix), which was prototyped and evaluated for military use by teams at Boeing, including sales.<ref name="Boeing_1967">{{citation |title=Facsimile transponder prototype at Boeing |orig-year=1967 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/8/84/Facsmile_transponder_prototype_at_Boeing%2C_1967.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121457/https://upload.wikimedia.org/wikipedia/en/8/84/Facsmile_transponder_prototype_at_Boeing%2C_1967.pdf |archive-date=2016-10-31}}</ref><ref name="Boeing_1966">{{citation |title=Drawings of portable fax machine for Boeing |orig-year=1966 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/d/d1/Drawings_of_portable_fax_machine_for_Boeing%2C_1966.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031203820/https://upload.wikimedia.org/wikipedia/en/d/d1/Drawings_of_portable_fax_machine_for_Boeing%2C_1966.pdf |archive-date=2016-10-31}}</ref> |
In 1952–1954, he filed five patent applications for a [[dot matrix teletypewriter]] (aka "teletype writer 7 stylus 35 dot matrix"), later granted in 1957 (see German patent #1,006,007<ref name="DE1006007">{{cite patent |country=DE |number=1006007 |status=patent |title=Umschalteinrichtung für Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind |gdate=1957-09-12 |fdate=1952-07-29 |pridate=1952-07-29 |inventor=Preikschat, Fritz Karl|assign=[[Telefonbau und Normalzeit G.m.b.H.]]}}</ref><ref name="DE1006007B">{{cite patent |country=DE |number=1006007B<!-- DE1952P0015749 --> |status=application |title=Umschalteinrichtung fuer Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind |pubdate=1957-04-11 |fdate=1952-07-29 |pridate=1952-07-29 |inventor=Preikschat, Fritz Karl <!-- |inventor-link=Fritz Karl Preikschat --> |assign=Preikschat, Fritz Karl |url=https://patents.google.com/patent/DE1006007B}}</ref><ref name="TuN_1957"/>). In April 1953, he was hired by [[Telefonbau und Normalzeit GmbH]] ([[TuN]], later called [[Tenovis]]). In 1956, TuN introduced the device to the [[Deutsche Bundespost]] (German Post Office), which did not show interest.<ref name="Preikschat_1989"/> In his final contract with TuN (dated May 31, 1957), he sold the five patent applications to TuN for 12,000 [[Deutsche Mark]]s and 50% of the device's net future profits (while retaining rights for the U.S. market).<ref name="TuN_1957">{{citation |title=Letter of TELEFONBAU and NORMALZEIT G.M.B.H. to Mr. Fritz Preikschat |author1=Telefonbau und Normalzeit GmbH |author-link1=Telefonbau und Normalzeit GmbH |author-first2=Fritz Karl |author-last2=Preikschat |author-link2=Fritz Karl Preikschat |language=German, English |type=Contract |date=1957-05-31 |location=Frankfurt am Main, Germany |url=https://en.wikipedia.org/wiki/File:Telefonbau_und_Normalzeit,_Fritz_Preikschat_1957_contract.pdf |access-date=2016-10-29 |url-status=live |archive-url=https://web.archive.org/web/20161029200707/https://upload.wikimedia.org/wikipedia/en/4/45/Telefonbau_und_Normalzeit%2C_Fritz_Preikschat_1957_contract.pdf |archive-date=2016-10-29 |quote=[…] 1) Patent 8101 Klasse 21a1, Gruppe 17, Anmeldetag: 29.7.1952, ''Fernschreiber [Teletypewriter]''; 2) Patent 15749 Klasse 21a1, Gruppe 7/01, Anmeldetag: 29.7.1952, ''Umschalteinrichtung für Fernschreiber, bei dem die Schriftzeichen in Rasterpunkte zerlegt sind [Coding equipment for a Teletypewriter at which characters are consisting of dots (RASTER – points)]''; 3) Patent 15759 Klasse 21a1, Anmeldetag: 29.7.1952, ''Schreibkopf für Raster-Fernschreibmaschine [Recording head for Matrix type (RASTER) Teletypewriter]''; 4) Patent 9043 Klasse 21a1, Anmeldetag 17.1.1953, ''Fernschreiber [Teletypewriter]''; 5) Patent 12196 Klasse 21a1, Anmeldetag 24.6.1954, ''Schreibkopf für Fernschreibmaschine [Recorder for Teletypewriter]'' […]}} (8 pages)</ref> Photos and working papers of the dot matrix teletypewriter prototype were submitted to his first U.S. employer, [[General Mills]], in 1957.<ref name="General-Mills_1957">{{citation |title=Dot matrix teletypewriter prototype photos for General Mills |orig-year=1957 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/9/95/Dot_matrix_teletypewriter_prototype_photos_for_General_Mills%2C_1957.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121055/https://upload.wikimedia.org/wikipedia/en/9/95/Dot_matrix_teletypewriter_prototype_photos_for_General_Mills%2C_1957.pdf |archive-date=2016-10-31}}</ref> A set of working papers for the dot matrix teletypewriter were published in 1961.<ref name="Working-paper_1961">{{citation |author-first=Fritz Karl |author-last=Preikschat |author-link=Fritz Karl Preikschat |title=Working papers on dot matrix teletypewriter |orig-year=1961 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/f/f6/Working_papers_on_dot_matrix_teletypewriter%2C_1961.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121145/https://upload.wikimedia.org/wikipedia/en/f/f6/Working_papers_on_dot_matrix_teletypewriter%2C_1961.pdf |archive-date=2016-10-31}}</ref> At [[Boeing]] in 1966–1967, the dot matrix teletypewriter design was the basis for a portable [[fax|facsimile]] machine (using dot matrix), which was prototyped and evaluated for military use by teams at Boeing, including sales.<ref name="Boeing_1967">{{citation |title=Facsimile transponder prototype at Boeing |orig-year=1967 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/8/84/Facsmile_transponder_prototype_at_Boeing%2C_1967.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031121457/https://upload.wikimedia.org/wikipedia/en/8/84/Facsmile_transponder_prototype_at_Boeing%2C_1967.pdf |archive-date=2016-10-31}}</ref><ref name="Boeing_1966">{{citation |title=Drawings of portable fax machine for Boeing |orig-year=1966 |date=2016 |url=https://upload.wikimedia.org/wikipedia/en/d/d1/Drawings_of_portable_fax_machine_for_Boeing%2C_1966.pdf |access-date=2016-10-31 |url-status=live |archive-url=https://web.archive.org/web/20161031203820/https://upload.wikimedia.org/wikipedia/en/d/d1/Drawings_of_portable_fax_machine_for_Boeing%2C_1966.pdf |archive-date=2016-10-31}}</ref> |
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== Emigration to |
== Emigration to America (1957) == |
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On June 28, 1957, he emigrated to the United States via [[Operation Paperclip]], sponsored by an [[United States Department of the Army|Army]] contract with [[General Mills]]. The contract was cancelled shortly afterwards, so he hired on as principal scientist at the Johns Hopkins [[Applied Physics Laboratory]], where he worked on satellite transponder communications. He became a U.S. citizen in 1962. |
On June 28, 1957, he emigrated to the United States via [[Operation Paperclip]], sponsored by an [[United States Department of the Army|Army]] contract with [[General Mills]]. The contract was cancelled shortly afterwards, so he hired on as principal scientist at the Johns Hopkins [[Applied Physics Laboratory]], where he worked on satellite transponder communications. He became a U.S. citizen in 1962. |
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