Crown Zellerbach Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D293402 Dispenser housing for liquidsExpiredApr 25, 86Dec 29, 87[]
4688335 Apparatus and method for drying fibrous web materialExpiredFeb 18, 86Aug 25, 87[F29B, F26B, F28D, D21F]
4643775 Fabric conditioning and cleaning systemExpiredJun 29, 84Feb 17, 87[B08B]
4644045 Method of making spunbonded webs from linear low density polyethyleneExpiredMar 14, 86Feb 17, 87[C08F]
4637858 Pyrolysis of black liquor at high temperatures using radiant energyExpiredFeb 25, 85Jan 20, 87[D21C]
4600064 Earth boring bit with bearing sleeveExpiredFeb 25, 85Jul 15, 86[E21B]
4597573 System for handling discrete sheetsExpiredFeb 07, 85Jul 01, 86[B65H]
4576675 System for securing a plurality of objects together with adhesive tapeExpiredAug 13, 84Mar 18, 86[B32B, B65B]
4551199 Apparatus and process for treating web materialExpiredJul 01, 82Nov 05, 85[D21H]
4548081 Ultrasonic softness testing systemExpiredJul 20, 84Oct 22, 85[G01N]
4548770 Subjecting film to corona discharge prior to compression rollingExpiredNov 17, 83Oct 22, 85[B29D]
4547349 Method of slaking limeExpiredDec 02, 83Oct 15, 85[C04B]
4542842 Pneumatic conveying method for flexible websExpiredNov 08, 84Sep 24, 85[B65H]
D280709 BottleExpiredAug 29, 83Sep 24, 85[]
4539259 Laminate for making tubesExpiredJul 02, 84Sep 03, 85[B65D, B32B]
4534399 Paper stock diffuser systemExpiredJun 27, 84Aug 13, 85[D21F]
4505412 Pneumatic conveyor system for flexible websExpiredOct 31, 83Mar 19, 85[B65H]
4493159 Shrink tunnel with movable gateExpiredJun 08, 83Jan 15, 85[F26B]
4484500 Web slitting and grooving systemExpiredSep 23, 82Nov 27, 84[B26D]
4472886 System and method for venting cooling air from filamentsExpiredJan 25, 82Sep 25, 84[F26B]

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