Individual holder
KNOPIK DUANE L
US·3 granted patents·98 citations·filing 1974–1982
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
3 records- 0179US3980138AUnderground fluid recovery deviceKNOPIK DUANE L·Filed 1974·Granted Sep 14, 1976·38 cites·6 claims
- 0277US4183407AExhaust system and process for removing underground contaminant vaporsKNOPIK DUANE L·Filed 1977·Granted Jan 15, 1980·53 cites·1 claims
- 0324US4404844ALeak detecting methodKNOPIK DUANE L·Filed 1982·Granted Sep 20, 1983·7 cites·1 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →