US2647836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film elements
Assignee: EIDP Inc
•
Filing: 1952-04-09
•
Granted: 1953-08-04
•
Expires: 1972-04-09
Abstract
No abstract record available.
Inventors
- 👤 Patten Stanley Hancock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PHOTOGRAPHIC FILM COMPRISING A HYDROPHOBIC FILM BASE HAVING ON ONE SURFACE A LAYER COMPRISING WERNER TYPE CHROMIUM-CARBOXYLIC ACID COMPLEX AND A FILM-FORMING BINGING AGENT AND HAVING DISPOSED ON THE OTHER SURFACE AT LEAST ONE COLLOIDAL SILVER HALIDE EMULSION LAYER, SAID CARBOXYLIC ACID BEING TAKEN FROM THE CLASS CONSISTING OF ALIPHACIT CARBOXYLIC ACIDS OF LESS THAN 6 CARBON ATOMS, AROMATIC CARBOXYLIC ACIDS OF 7 CARBON ATOMS AND ARALKYL ACIDS OF NOT MORE THAN 8 CARBON ATOMS AND SUCH ACIDS THAT CONTAIN AT LEAST ONE DIPOLE GROUP.
Claim 2
Dependent Claim
86 words
A PHOTOGRAPHIC FILM COMPRISING A HYDROPHOBIC FILM BASE HAVING ON ONE SURFACE A LAYER COMPRISING WERNER TYPE CHROMIUM-CARBOXYLIC ACID COMPLEX AND A FILM-FORMING BINGING AGENT AND HAVING DISPOSED ON THE OTHER SURFACE AT LEAST ONE COLLOIDAL SILVER HALIDE EMULSION LAYER, SAID CARBOXYLIC ACID BEING TAKEN FROM THE CLASS CONSISTING OF ALIPHACIT CARBOXYLIC ACIDS OF LESS THAN 6 CARBON ATOMS, AROMATIC CARBOXYLIC ACIDS OF 7 CARBON ATOMS AND ARALKYL ACIDS OF NOT MORE THAN 8 CARBON ATOMS AND SUCH ACIDS THAT CONTAIN AT LEAST ONE DIPOLE GROUP.
References Cited (Backward Citations)
US2403533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |