CHARLES ROBERT KAEMPEN

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5590803 Composite double-wall underground tank structure and method for making sameExpiredJul 06, 94Jan 07, 97[B65D]
5222769 Double-wall composite pipe and coupling structure assemblyExpiredFeb 26, 92Jun 29, 93[F16L]
4786536 Composite deflectable spring structureExpiredNov 09, 87Nov 22, 88[F16L, B65H, B27N]
4775563 Composite spring-lock couplingExpiredNov 09, 87Oct 04, 88[F16L, B65H, B32B]
4762583 Method for making composite twine structuresExpiredApr 01, 87Aug 09, 88[B65H]
4757658 Panel structure with composite couplingExpiredApr 01, 87Jul 19, 88[E04C, D02G]
4758024 Composite flanged coupling structureExpiredApr 01, 87Jul 19, 88[F16L]
4740422 Multiple composite twine structureExpiredApr 01, 87Apr 26, 88[D02G]
4680923 Composite twine structureExpiredMar 27, 85Jul 21, 87[F16S, D02G, B32B]
4385644 Composite laminate joint structure and method and apparatus for making sameExpiredJan 11, 82May 31, 83[F16L, B65H, B32B]

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