Pilkington Brothers Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4544395 Cationic surface coating of flat glassExpiredMar 03, 81Oct 01, 85[C03C]
4406105 Structural glass assembliesExpiredAug 12, 80Sep 27, 83[E04B]
4400193 Method of thermal toughening of glass in a fluidized bedExpiredOct 19, 79Aug 23, 83[C03B]
4372774 Thermal treatment of glassExpiredJul 21, 81Feb 08, 83[C03B]
4349634 Method of preparing photochromic glassExpiredAug 11, 80Sep 14, 82[C03C, C03B]
4345036 Optical glass fibres and method of forming such fibresExpiredJan 16, 81Aug 17, 82[C03C, C03B]
4345037 Alkali resistant glass fibres for cement reinforcementExpiredFeb 26, 81Aug 17, 82[C03C]
4343116 Processes for finishing glass surfacesExpiredJul 15, 80Aug 10, 82[B24B]
4332605 Thermally treating articles with particulate material and apparatus thereforExpiredOct 20, 80Jun 01, 82[C03B]
4330628 Alkali-resistant glass fibresExpiredMar 17, 80May 18, 82[C03C, C04B]
4316565 Sheet transfer apparatusExpiredFeb 21, 79Feb 23, 82[C03B, B65H]
4299018 Roll for use under high or low temperature conditionsExpiredApr 09, 79Nov 10, 81[B60B, B21B]
4290813 Photochromic boro-silicate glassExpiredMay 18, 78Sep 22, 81[C03C]
4238216 Heating glass batch materialExpiredApr 30, 79Dec 09, 80[C03B]
4221579 Thermal treatment of glass sheetsExpiredApr 19, 79Sep 09, 80[C03B]
4220066 Apparatus for cutting or scoring sheet materialExpiredAug 02, 78Sep 02, 80[B26D]
4217125 Method and apparatus for manufacturing flat glass on a molten metal bathExpiredNov 27, 74Aug 12, 80[C03B]
4214863 Rotary pan pelletizersExpiredApr 25, 79Jul 29, 80[B29B]
4205976 Thermal toughening of glassExpiredDec 05, 78Jun 03, 80[C03B]
4204852 Method of and apparatus for producing a glass fibre bundle for use in optical communications systemsExpiredJul 12, 78May 27, 80[C03B]

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