National Patent Development Corp
National PActive Patents
0
Total Holdings
37
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4303066A | Burn dressing | Expired / Lapsed | 1979-06-28 | 1981-12-01 | 33 | Details |
| US4298002A | Porous hydrophilic materials, chambers therefrom, and devic… | Expired / Lapsed | 1979-09-10 | 1981-11-03 | 44 | Details |
| US4272518A | Plastic wound bandage | Expired / Lapsed | 1979-07-10 | 1981-06-09 | 36 | Details |
| US4252865A | Highly solar-energy absorbing device and method of making t… | Expired / Lapsed | 1978-05-24 | 1981-02-24 | 40 | Details |
| US4121587A | Root canal delivery syringe | Expired / Lapsed | 1977-03-03 | 1978-10-24 | 5 | Details |
| US4081402A | Hydrophilic absorbents | Expired / Lapsed | 1975-02-19 | 1978-03-28 | 18 | Details |
| US4064086A | Thermoplastic hydrogels | Expired / Lapsed | 1976-07-13 | 1977-12-20 | 44 | Details |
| US3941858A | Hydrophilic polymers, articles and methods of making same | Expired / Lapsed | 1973-08-07 | 1976-03-02 | 11 | Details |
| US3935368A | Vinyl chloride flooring material coated with a hydrophilic … | Expired / Lapsed | 1971-07-01 | 1976-01-27 | 3 | Details |
| US3925895A | Hydrophilic root canal filling material | Expired / Lapsed | 1973-04-26 | 1975-12-16 | 30 | Details |
| US3881026A | Powdered water-insoluble polymers containing absorbed addit… | Expired / Lapsed | 1971-06-14 | 1975-04-29 | 6 | Details |
| US3868447A | Hema paste | Expired / Lapsed | 1972-02-02 | 1975-02-25 | 19 | Details |
| US3863628A | Dental treatment method and apparatus | Expired / Lapsed | 1972-12-06 | 1975-02-04 | 11 | Details |
| US3849185A | Method of preparing surgical sutures | Expired / Lapsed | 1971-12-13 | 1974-11-19 | 7 | Details |
| US3784540A | Process of preparing soluble hema-based polymers | Expired / Lapsed | 1971-10-05 | 1974-01-08 | 0 | Details |
| US3767790A | Microorganisms | Expired / Lapsed | 1972-02-11 | 1973-10-23 | 0 | Details |
| US3695921A | Method of coating a catheter | Expired / Lapsed | 1970-09-09 | 1972-10-03 | 0 | Details |
| US3681089A | Water soluble copolymers containing an entrapped flavoring … | Expired / Lapsed | 1970-09-09 | 1972-08-01 | 0 | Details |
| US3681248A | Water soluble entrapping of a fragrance | Expired / Lapsed | 1970-09-09 | 1972-08-01 | 0 | Details |
| US3660563A | Water soluble entrapping of a drug | Expired / Lapsed | 1970-09-09 | 1972-05-02 | 0 | Details |
| US3641237A | Zero order release constant elution rate drug dosage | Expired / Lapsed | 1970-09-30 | 1972-02-08 | 0 | Details |
| US3632039A | Laundry bag | Expired / Lapsed | 1970-08-25 | 1972-01-04 | 3 | Details |
| US3632416A | Fibrous textile materials impregnated with hydroxyalkyl met… | Expired / Lapsed | 1967-10-27 | 1972-01-04 | 7 | Details |
| US3618213A | Denture liners | Expired / Lapsed | 1970-04-27 | 1971-11-09 | 0 | Details |
| US3612348A | Pill dispenser with disposable magazine and indicia | Expired / Lapsed | 1969-11-17 | 1971-10-12 | 11 | Details |
| US3596833A | Fragrance-releasing flowerpot | Expired / Lapsed | 1968-09-05 | 1971-08-03 | 7 | Details |
| US3577516A | Preparation of spray on bandage | Expired / Lapsed | 1969-12-02 | 1971-05-04 | 0 | Details |
| US3577512A | Sustained release tablets | Expired / Lapsed | 1968-10-11 | 1971-05-04 | 0 | Details |
| US3576760A | Water soluble entrapping | Expired / Lapsed | 1969-06-13 | 1971-04-27 | 0 | Details |
| US3566874A | Catheter | Expired / Lapsed | 1968-08-13 | 1971-03-02 | 13 | Details |
| US3520949A | Hydrophilic polymers,articles and methods of making same | Expired / Lapsed | 1966-07-26 | 1970-07-21 | 0 | Details |
| US3515579A | Non-fogging transparent material | Expired / Lapsed | 1969-02-26 | 1970-06-02 | 0 | Details |
| US3488111A | Hydrophilic hydrogel corneal contact lens with hard central… | Expired / Lapsed | 1967-03-16 | 1970-01-06 | 0 | Details |
| US3428043A | Bandage containing absorbed therapeutic materials | Expired / Lapsed | 1966-06-09 | 1969-02-18 | 0 | Details |
| US3400890A | Fragrance releasing device | Expired / Lapsed | 1966-12-07 | 1968-09-10 | 0 | Details |
| US3311229A | Tablet package | Expired / Lapsed | 1965-01-21 | 1967-03-28 | 2 | Details |
| US3255753A | Electrical sleep machine and sleep inducing method | Expired / Lapsed | 1963-03-22 | 1966-06-14 | 2 | Details |