US3634544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing films of poly-gamma-methyl glutamate modified with polyurethane resin
Assignee: Ajinomoto Co Inc
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Filing: 1969-04-30
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Granted: 1972-01-11
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Expires: 1989-04-30
Abstract
Abstract A SOLUTION OF POLY-Y-METHYL GLUTAMATE MODIFIED WITH POLYURETHANE RESIN IN A MIXTURE OF A CHLORINATED ALIPHATIC HYDROCARBON SOLVENT WITH A WATER SOLUBLE ORGANIC SOLVENT FREE FROM ACTIVE HYDROGEN AND HAVING A BOILING POINT HIGHER THAN THAT OF THE CHLORINATED HYDROCARBON IS CAST TO FORM A SOLVATED FILM, THE CHLORINATED HYDROCARBON IS EVAPORATED, AND THE RESULTING GEL IS LEACHED WITH WATER TO REMOVE THE RESIDUAL SOLVENT, LEAVING BEHIND A LEATHER-LIKE FILM OF HIGH WATER VAPOR PERMEABILITY.
Inventors
- 👤 Yoshifumi Takeda
- 👤 Yasuo Takagi
- 👤 Shigeo Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:31
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/125; D06N3/126; B; B29; B29D; B29D7/00; B29D7/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |