SENSIDYNE, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5562002 Positive displacement piston flow meter with damping assemblyExpiredFeb 03, 95Oct 08, 96[G01F]
5408886 Positive displacement piston flow meter with internal valveExpiredDec 17, 93Apr 25, 95[G01F]
5295396 Positive displacement piston flow meter for air flow measurementExpiredJul 28, 93Mar 22, 94[G01F]
5251489 Fluid flow measuring deviceExpiredOct 22, 91Oct 12, 93[G01F]
5209114 Reciprocating piston flow meterExpiredJun 26, 91May 11, 93[G01F]
5193389 Reciprocating piston positive displacement flow meterExpiredMay 29, 91Mar 16, 93[G01F]
4945749 Cold forming dies and cold forming processExpiredOct 30, 89Aug 07, 90[B21K, B21D]
4931000 Double acting diaphragm air pumpExpiredMar 02, 89Jun 05, 90[F04B]
4904987 Air sampling and alarm control systemExpiredDec 16, 87Feb 27, 90[G08B]
4896548 Fluid sampler with miniature single-acting pump assemblyExpiredDec 27, 88Jan 30, 90[G01N]
4860592 Soap film gas flow measuring deviceExpiredDec 16, 87Aug 29, 89[G01F]
4840919 Gas dosimeter for colorimetrically indicating the presence of amidesExpiredMar 03, 87Jun 20, 89[G01N]
4772560 Laminated wafer for sensing and monitoring exposure to gasesExpiredMay 19, 86Sep 20, 88[G01N, C01G]
4762004 Gas flowmeter and soap bubble generatorExpiredSep 25, 86Aug 09, 88[G01F]
4691577 Soap film gas flowmeterExpiredMar 10, 86Sep 08, 87[G01F]
4666859 Reagent for colorimetrically indicating the presence of formaldehydeExpiredMay 19, 86May 19, 87[G01N]
4597769 Coal demineralization and depyritization processExpiredMar 11, 85Jul 01, 86[C10L]
4576054 Dual mode gas sampler and pneumatic flow control systemExpiredMay 21, 84Mar 18, 86[G05D]
4532814 Fluid sampler and gas flow control system and methodExpiredJul 12, 83Aug 06, 85[G01N]
4465493 Desulfurization process for coal and other carbonaceous materialsExpiredDec 28, 81Aug 14, 84[C10L]

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