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Patent:US4182043
08.01.1980 Nemoto, Yoshio : Drawing instrument for an ellipse
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Patent:US4184261
22.01.1980 Wolfgang P. Buerner Los Angeles Scientific Instrument Co., Inc. : Multipurpose drafting and measuring instrument
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12.02.1980 Yamada, Yoshikazu (P) Yamada-Graphics Corp. : Perpetual and multi-year calendars
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19.02.1980 Labove Larry, Mitchell Robert IBM (P) : Slide Rule for hyperalimentation dosage computations
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18.03.1980 Katz, Joseph : Tidal depth calculator
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25.03.1980 Wojcik, Tadeusz P. : Drawing instrument
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03.06.1980 Peter T. Quinn Stephen Blecher Rollei of America, Inc. : Calculator for electronic flash
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Patent:US4210093
01.07.1980 Baker, Richard A. (788 Woods La., Grosse Pointe Woods, MI : Counting device
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19.08.1980 Schindler, John R. (P.O. Box 5171, Klamath Falls, OR 97601) : Time-distance calculator
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19.08.1980 Chin, Yi (P) (23356 Batey Ave., Harbor City, CA 90710) Chen, Yi (P) : Educational mechanical calculator
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07.10.1980 Chen Jen-Sheng, Chen Jen-Hung : Ellipsograph
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21.10.1980 Gabriel B. Cherian : Biorhythmic device
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28.10.1980 Oerth Daniel P Oerth Daniel P : Biorhythmic Slide Rule
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Patent:US4233757
18.11.1980 Narcise, Jacqualine (1300 Delaware St., Berkeley, CA 94702) : Mathematics device
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18.11.1980 Bromberg, Howard M. (P.O. Box 316 Kingsbridge Station, New : Slide calculator
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30.12.1980 Dugas Madeleine, Wolf Robert Graphic Calculator : Slide Rule
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01.01.1980 R. Wallace Wright : Slide chart
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29.01.1980 Exel, Gerrit A. van (P) : Slide Frame for Calculator or the like
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08.07.1980 Seely, Douglas D. (P) : Multiple Scale Rule