Inventor · disambiguated record
Derek Ferns
Also filed as: FERNS DEREK
11 granted patents·198 citations·filing 1978–1992
91Inventor score
Files withSELFLEVEL COVERS JERSEY LTD4VON ROLL AG3ROLL AG VAN1SELF LEVEL COVERS AKTIENGESELL1SELFLEVEL COVERS AG1
Top patents by PatentIndex Score
11 records- 0175US4909660AGrating with a locking mechanismVON ROLL AG·Filed 1988·Granted Mar 20, 1990·34 cites·3 claims
- 0275US4126404AGratingSELF LEVEL COVERS AKTIENGESELL·Filed 1978·Granted Nov 21, 1978·34 cites·12 claims
- 0374US4861186ACovering for an opening with a cover or grating placed in a frameVON ROLL AG·Filed 1988·Granted Aug 29, 1989·34 cites·13 claims
- 0466US4174183ASupport frameSELFLEVEL COVERS AG·Filed 1978·Granted Nov 13, 1979·22 cites·7 claims
- 0560US4955752ACover assembly with a locking mechanismROLL AG VAN·Filed 1989·Granted Sep 11, 1990·22 cites·9 claims
- 0651US4936703AFrame for a covering for an opening protected by a cover or gratingVON ROLL AG·Filed 1988·Granted Jun 26, 1990·15 cites·12 claims
- 0745US4508470AManhole/access cover and frame assembliesSELFLEVEL COVERS JERSEY LTD·Filed 1983·Granted Apr 2, 1985·10 cites·4 claims
- 0839US4498804AManhole/access cover and frame assembliesSELFLEVEL COVERS JERSEY LTD·Filed 1983·Granted Feb 12, 1985·7 cites·12 claims
- 0937US5395115AGolfing facilityFiled 1992·Granted Mar 7, 1995·15 cites·12 claims
- 1031US4549833AFrame members for supporting covers or gratingsSELFLEVEL COVERS JERSEY LTD·Filed 1982·Granted Oct 29, 1985·4 cites·7 claims
- 1128US4483110AMethods of installing frames for access pits and manholesSELFLEVEL COVERS JERSEY LTD·Filed 1982·Granted Nov 20, 1984·1 cites·8 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →