Patent US2604668A successfully refreshed from Google Patents.
US2604668A
Expired / Lapsed
US
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Packaging films and process of manufacturing same
Assignee: Bridgestone Firestone Inc
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Filing: 1949-04-12
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Granted: 1952-07-29
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Expires: 1969-04-12
Abstract
No abstract record available.
Inventors
- 👤 Verle A Miller
- 👤 Robert J Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:08
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/34; C08C19/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
PROCESS WHICH COMPRISES FORMING A SOLUTION, IN AN ORGANIC SOLVENT THEREFOR, OF A COPOLYMER OF BUTADIENE AND METHACRYLIC ACID CONTAINING FROM 40% TO 80% OF BUTADIENE BY WEIGHT, THE BALANCE BEING METHACRYLIC ACID, SPREADING SAID SOLUTION AS A THIN LAYER UPON A SMOOTH CASTING SURFACE, DRYING SAID LAYER TO FORM A FILM, STRIPPING THE FILM FROM SAID SURFACE, CONTACTING SAID FILM WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, AND THEREAFTER CONTACTING SAID FILM WITH AN AQUEOUS SOLUTION OF A SOLUBLE POLYALENT METAL SALT, THE TIME OF CONTACT WITH SAID RESPECTIVE SOLUTIONS BEING AT LEAST ONE-HALF SECOND.
References Cited (Backward Citations)
US2274150A
Cited
US2234204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |