Hirai Engineering Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5706617 Roof system utilizing a solar cellExpiredJan 02, 96Jan 13, 98[E04D]
5531049 Roof mounted light transmitting frameExpiredMar 09, 94Jul 02, 96[E04B]
5497587 Roof system utilizing a solar cellExpiredNov 19, 93Mar 12, 96[E04D]
5406936 RoofExpiredOct 19, 90Apr 18, 95[F24J]
5367843 Roof apparatusExpiredAug 24, 93Nov 29, 94[E04B]
5121583 RoofExpiredOct 23, 89Jun 16, 92[E04D]

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