Assignee
SPERR JR CHARLES J
US·3 granted patents·65 citations·filing 1981–1988
Top patents by PatentIndex Score
3 records- 0167US4379712AEvaporative coolerSPERR JR CHARLES J·Filed 1981·Granted Apr 12, 1983·26 cites·4 claims
- 0258US4752419AEvaporative coolerSPERR JR CHARLES J·Filed 1986·Granted Jun 21, 1988·22 cites·12 claims
- 0351US4851162AEvaporative coolerSPERR JR CHARLES J·Filed 1988·Granted Jul 25, 1989·17 cites·18 claims
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