Patent US2983354A successfully refreshed from Google Patents.
Patent US2698239A successfully refreshed from Google Patents.
US2698239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic films
Assignee: EIDP Inc
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Filing: 1951-01-20
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Granted: 1954-12-28
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Expires: 1971-01-20
Abstract
No abstract record available.
Inventors
- 👤 Alles Francis Peter
- 👤 Saner William Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:19
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A FILM BASE COMPRISING A HYDROPHOBIC FILM BEARING ON AT LEAST ONE SURFACE THEREOF A THIN LAYER HAVING A DIFFERENT COMPOSITION FROM SAID FILM AND COMPRISING A HIGHLY POLYMERIC TRICOMPONENT POLYESTER OF TEREPHTHALIC ACID, A POLYMETHYLENE GLYCOL HAVING FROM 2 TO 10 METHYLENE GROUPS AND A COMPOUND TAKEN FROM THE GROUP CONSISTING OF THE POLYETHYLENE GLYCOLS CONTAINING 1 TO 5 OXYETHYLENE RADICALS, THE SATURATED ALIPHATIC DICARBOXYLIC ACIDS OF 4 TO 16 CARBON ATOMS AND THEIR ACID CHLORIDES, ACID BROMIDES AND DIESTERS WITH AN ALKANOL OF 1 TO 6 CARBON ATOMS SAID POLYESTER BEING SOLUBLE TO THE EXTENT OF AT LEAST 1/2% BY WEIGHT IN TRICHLORETHYLENE AND HAVING A WATER-PERMEABLE COLLOID LAYER ON THE LAYER OF POLYESTER SAID COLLOID BEING TAKEN FROM THE GROUP CONSISTING OF WATER-PERMEABLE PROTEINS, CELLULOSE DERIVATIVES, POLYVINYL ALCOHOL AND POLYVINYL ACETALS.
Claim 2
Dependent Claim
134 words
A FILM BASE COMPRISING A HYDROPHOBIC FILM BEARING ON AT LEAST ONE SURFACE THEREOF A THIN LAYER HAVING A DIFFERENT COMPOSITION FROM SAID FILM AND COMPRISING A HIGHLY POLYMERIC TRICOMPONENT POLYESTER OF TEREPHTHALIC ACID, A POLYMETHYLENE GLYCOL HAVING FROM 2 TO 10 METHYLENE GROUPS AND A COMPOUND TAKEN FROM THE GROUP CONSISTING OF THE POLYETHYLENE GLYCOLS CONTAINING 1 TO 5 OXYETHYLENE RADICALS, THE SATURATED ALIPHATIC DICARBOXYLIC ACIDS OF 4 TO 16 CARBON ATOMS AND THEIR ACID CHLORIDES, ACID BROMIDES AND DIESTERS WITH AN ALKANOL OF 1 TO 6 CARBON ATOMS SAID POLYESTER BEING SOLUBLE TO THE EXTENT OF AT LEAST 1/2% BY WEIGHT IN TRICHLORETHYLENE AND HAVING A WATER-PERMEABLE COLLOID LAYER ON THE LAYER OF POLYESTER SAID COLLOID BEING TAKEN FROM THE GROUP CONSISTING OF WATER-PERMEABLE PROTEINS, CELLULOSE DERIVATIVES, POLYVINYL ALCOHOL AND POLYVINYL ACETALS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |