Assignee
POLK INVESTMENT CORP
US·6 granted patents·230 citations·filing 1987–1995
Top patents by PatentIndex Score
6 records- 0180US4759066ASound system with isolation of dimensional sub-speakersPOLK INVESTMENT CORP·Filed 1987·Granted Jul 19, 1988·42 cites·7 claims
- 0277US4903300ACompact and efficient sub-woofer system and method for installation in structural partitionsPOLK INVESTMENT CORP·Filed 1989·Granted Feb 20, 1990·62 cites·22 claims
- 0361US5517573APorted loudspeaker system and method with reduced air turbulencePOLK INVESTMENT CORP·Filed 1994·Granted May 14, 1996·36 cites·11 claims
- 0457US5696357ABass-reflex loudspeakerPOLK INVESTMENT CORP·Filed 1995·Granted Dec 9, 1997·43 cites·11 claims
- 0552US4924963ACompact and efficient sub-woofer system and method for installation in structural partitionsPOLK INVESTMENT CORP·Filed 1989·Granted May 15, 1990·25 cites·21 claims
- 0650US5475764ABandpass woofer and methodPOLK INVESTMENT CORP·Filed 1994·Granted Dec 12, 1995·22 cites·22 claims
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