Individual holder
CHANG YAN P
US·4 granted patents·137 citations·filing 1982–1988
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
4 records- 0186US4907410AThermal energy from environmental fluidsCHANG YAN P·Filed 1988·Granted Mar 13, 1990·58 cites·13 claims
- 0275US4541246ALimitless heat source power plantsCHANG YAN P·Filed 1983·Granted Sep 17, 1985·34 cites·8 claims
- 0370US4433545AThermal power plants and heat exchangers for use therewithCHANG YAN P·Filed 1982·Granted Feb 28, 1984·30 cites·14 claims
- 0454US4516402ALimitless and limited heat sources power plantsCHANG YAN P·Filed 1983·Granted May 14, 1985·15 cites·8 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →