Assignee
PREFCO PRODUCTS INC
US·10 granted patents·111 citations·filing 1978–1980
Top patents by PatentIndex Score
10 records- 0171US4241748AButterfly smoke/fire damperPREFCO PRODUCTS INC·Filed 1978·Granted Dec 30, 1980·23 cites·19 claims
- 0261US4263930ADiffuser concealable, volume control, heat-responsive, semi-automatic resetting, butterfly damper and operatorPREFCO PRODUCTS INC·Filed 1978·Granted Apr 28, 1981·18 cites·29 claims
- 0356US4295486ALow cost, diffuser concealable, volume control, heat responsive, resettable, butterfly damper operatorPREFCO PRODUCTS INC·Filed 1979·Granted Oct 20, 1981·14 cites·30 claims
- 0455US4219185ARotating blade fire damperPREFCO PRODUCTS INC·Filed 1978·Granted Aug 26, 1980·11 cites·8 claims
- 0554US4185657AEconomy, angle-blade damper kitPREFCO PRODUCTS INC·Filed 1978·Granted Jan 29, 1980·11 cites·6 claims
- 0652US4404990AEconomy, angle-blade damper kitPREFCO PRODUCTS INC·Filed 1980·Granted Sep 20, 1983·11 cites·1 claims
- 0743US4304427ADuct-damper interface adaptorPREFCO PRODUCTS INC·Filed 1978·Granted Dec 8, 1981·10 cites·12 claims
- 0843US4185658ARotating blade damperPREFCO PRODUCTS INC·Filed 1978·Granted Jan 29, 1980·6 cites·10 claims
- 0934US4277870AMethod for installing an angle blade damperPREFCO PRODUCTS INC·Filed 1979·Granted Jul 14, 1981·4 cites·6 claims
- 1033US4183129AMethod of forming a smoke, fire and air control damper with stamped blade hingePREFCO PRODUCTS INC·Filed 1978·Granted Jan 15, 1980·3 cites·3 claims
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