NATIONAL PATENT DEVELOPMENT CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5045266 Process of making a hearing aid earmold in situExpiredNov 02, 89Sep 03, 91[B29C]
5039342 Modified asphalt cement compositions and methods of producing the sameExpiredMay 08, 90Aug 13, 91[C08L]
4957436 Dental pump system for chemical caries removalExpiredMar 28, 86Sep 18, 90[A61C]
4770632 Delivery system for dental treatment solutionExpiredDec 30, 85Sep 13, 88[A61C]
4729949 System and methods for cell selectionExpiredNov 08, 83Mar 08, 88[C12Q, C12M]
4606342 Cautery device having a variable temperature cautery tipExpiredFeb 15, 85Aug 19, 86[A61B]
4587129 Hydrophilic gels containing high amounts of fragranceExpiredJun 01, 82May 06, 86[A61K, A23L]
4452925 Biologically stabilized compositions comprising collagen as the minor component with ethylenically unsaturated compounds used as contact lensesExpiredFeb 09, 81Jun 05, 84[C08H, G02C]
4407766 Molds and procedure for producing truncated contact lensesExpiredMay 26, 81Oct 04, 83[B29D]
4388428 Biologically stabilized compositions comprising collagen as the major component with ethylenically unsaturated compounds used as contact lensesExpiredJul 20, 81Jun 14, 83[C08H]
4388436 Permeable contact lensExpiredJun 08, 81Jun 14, 83[C08F, G02C]
4384462 Multiple compressor refrigeration system and controller thereofExpiredNov 20, 80May 24, 83[F25B]
4303066 Burn dressingExpiredJun 28, 79Dec 01, 81[A61L]
4298002 Porous hydrophilic materials, chambers therefrom, and devices comprising such chambers and biologically active tissue and methods of preparationExpiredSep 10, 79Nov 03, 81[A61M]
4275138 Photosensitive diazonium compound containing composition and article with .beta.-hydroxyalkyl acrylate or methacrylateExpiredSep 14, 76Jun 23, 81[G03C]
4272518 Plastic wound bandageExpiredJul 10, 79Jun 09, 81[A61K]
4252865 Highly solar-energy absorbing device and method of making the sameExpiredMay 24, 78Feb 24, 81[C23C, H01L, F24J]
4211588 Method of manufacturing a vented piercing device for intravenous administration setsExpiredMay 10, 78Jul 08, 80[A61M, B32B]
4208365 Method and apparatus for molding toric contact lensesExpiredDec 20, 78Jun 17, 80[B29D]
4201589 Silver halide photo-sensitive material prepared with solvent and solvent soluble polymerExpiredApr 20, 79May 06, 80[G03C]

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