USG Acoustical Products Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4711685 Soft textured reveal edge ceiling board and process for its manufactureExpiredOct 30, 86Dec 08, 87[B32B]
4681613 Slag furnace melt flow control valveExpiredMar 21, 86Jul 21, 87[C03B]
4670032 Melt flow control valveExpiredMar 21, 86Jun 02, 87[C03B]
4613627 Process for the manufacture of shaped fibrous products and the resultant productExpiredOct 17, 83Sep 23, 86[C08J, B32B]

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