Patent US2976148A successfully refreshed from Google Patents.
US2976148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic backing layers for photographic film
Assignee: GAF Chemicals Corp
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Filing: 1957-01-02
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Granted: 1961-03-21
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Expires: 1977-01-02
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Walford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A LIGHT SENSATIVE PHOTOGRAPHIC ELEMENT COMPRISING A CELLULOSE ESTER FILM SUPPORT CARRYING A SILVER HALIDE EMULSION LAYER, SAID ELEMENT HAVING AN ANTISTATIC BACKING LAYER COMPRISING AN ALKALI METAL SALT OF A TRIPLE POLYMER OBTAINED BY THE COPOLYMERIZATION OF ONE MOLAR EQUIVALENT OF VINYL ACETATE, TWO MOLAR EQUIVALENTS OF ACRYLIC ACID AND ONE MOLAR EQUIVALENT OF STYRENE, SAID BACKING LAYER HAVING UNIFORMLY DISPERSED THEREIN THE ALKALI METAL SALT OF A FATTY ACID HAVING FROM 8 TO 18 CARBON ATOMS, THE AMOUNT OF FATTY ACID ALKALI METAL SALT DISPERSED IN THE TRIPLE POLYMER ALKALI METAL SALT BEING FROM 5 TO 20 PERCENT BY WEIGHT BASED ON THE AMOUNT OF THE TRIPLE POLYMER ALKALI METAL SALT.
Claim 2
Dependent Claim
113 words
A LIGHT SENSATIVE PHOTOGRAPHIC ELEMENT COMPRISING A CELLULOSE ESTER FILM SUPPORT CARRYING A SILVER HALIDE EMULSION LAYER, SAID ELEMENT HAVING AN ANTISTATIC BACKING LAYER COMPRISING AN ALKALI METAL SALT OF A TRIPLE POLYMER OBTAINED BY THE COPOLYMERIZATION OF ONE MOLAR EQUIVALENT OF VINYL ACETATE, TWO MOLAR EQUIVALENTS OF ACRYLIC ACID AND ONE MOLAR EQUIVALENT OF STYRENE, SAID BACKING LAYER HAVING UNIFORMLY DISPERSED THEREIN THE ALKALI METAL SALT OF A FATTY ACID HAVING FROM 8 TO 18 CARBON ATOMS, THE AMOUNT OF FATTY ACID ALKALI METAL SALT DISPERSED IN THE TRIPLE POLYMER ALKALI METAL SALT BEING FROM 5 TO 20 PERCENT BY WEIGHT BASED ON THE AMOUNT OF THE TRIPLE POLYMER ALKALI METAL SALT.
References Cited (Backward Citations)
US1939213A
Cited
US2074647A
Cited
US2548318A
Cited
US2545702A
Cited
US2737502A
Cited
US2725297A
Cited
US2717834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |