C.A. Schroeder, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5167260 Duct core with strengthening tapeExpiredJun 20, 88Dec 01, 92[F16L]
4801316 Molded fiberglass air return filter grilleExpiredDec 03, 87Jan 31, 89[B01D]
4713099 Molded fiberglass air return filter grilleExpiredJun 05, 86Dec 15, 87[B01D]
4478657 Method for strengthening duct coresExpiredJan 06, 83Oct 23, 84[B29C]
4400863 Method of making a rigid fiberglass duct having an integral bendable elbowExpiredNov 02, 81Aug 30, 83[B23P, B31C]
4266470 Universal air diffuserExpiredOct 24, 79May 12, 81[F24F]

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