NATIONAL PATENT DEVELOPMENT CORPORATION
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Sep 03, 1991 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 1,031 Total Citation Count
- Sep 14, 1976 Earliest Filing
- 20 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
- No Technology to Display
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Recent Publications
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Recent Patents
- No Recent Patents to Display
Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
5039342 Modified asphalt cement compositions and methods of producing the sameExpiredMay 08, 90Aug 13, 91[C08L]
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]
4388428 Biologically stabilized compositions comprising collagen as the major component with ethylenically unsaturated compounds used as contact lensesExpiredJul 20, 81Jun 14, 83[C08H]
4384462 Multiple compressor refrigeration system and controller thereofExpiredNov 20, 80May 24, 83[F25B]
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]
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]
4201589 Silver halide photo-sensitive material prepared with solvent and solvent soluble polymerExpiredApr 20, 79May 06, 80[G03C]
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