Assignee
SIGMA RES INC
US·6 granted patents·300 citations·filing 1980–1997
Top patents by PatentIndex Score
6 records- 0190US4798056ADirect expansion solar collector-heat pump systemSIGMA RES INC·Filed 1982·Granted Jan 17, 1989·81 cites·5 claims
- 0283US5708231ADelayed release cartridge for a firearmSIGMA RES INC·Filed 1996·Granted Jan 13, 1998·56 cites·14 claims
- 0381US4522064AUltrasonic method and apparatus for determining the depth of a crack in a solid materialSIGMA RES INC·Filed 1983·Granted Jun 11, 1985·71 cites·9 claims
- 0472US4625167AFlaw imaging in ferrous and nonferrous materials using magneto-optic visualizationSIGMA RES INC·Filed 1983·Granted Nov 25, 1986·30 cites·17 claims
- 0567US5753846ABarrel extender with recoil reductionSIGMA RES INC·Filed 1997·Granted May 19, 1998·39 cites·18 claims
- 0664US4392359ADirect expansion solar collector-heat pump systemSIGMA RES INC·Filed 1980·Granted Jul 12, 1983·23 cites·1 claims
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