Individual holder
SPARLIN DERRY D
US·3 granted patents·202 citations·filing 1987–1993
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
3 records- 0188US4771829AWell liner with selective isolation screenSPARLIN DERRY D·Filed 1987·Granted Sep 20, 1988·88 cites·27 claims
- 0283US5355948APermeable isolation sectioned screenSPARLIN DERRY D·Filed 1992·Granted Oct 18, 1994·48 cites·27 claims
- 0377US5355949AWell liner with dual concentric half screensSPARLIN DERRY D·Filed 1993·Granted Oct 18, 1994·66 cites·40 claims
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