Patent US4129474A successfully refreshed from Google Patents.
Patent US3791857A successfully refreshed from Google Patents.
US3791857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelatin-containing photographic layers having improved physical properties
Assignee: Agfa Gevaert AG
•
Filing: 1971-08-17
•
Granted: 1974-02-12
•
Expires: 1991-08-17
Abstract
Abstract The mechanical properties of gelatin layers are improved by the addition of a graft polymer of a cationic or anionic polyurethane, with polymerizable vinyl compounds.
Inventors
- 👤 G Balle
- 👤 F Nittel
- 👤 W Himmelmann
- 👤 O Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; C; C08; C08F; C08F283/00; C08F283/006; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T428/31573; Y10T428/31725; Y10T428/31768; Y10T428/31772; Y10T428/31775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
The photographic material of claim 1 wherein the polymerizable material when polymerized alone produces a soft elastic polymer.
Claim 2
Dependent Claim
48 words
The photographic material of claim 1 wherein the polymerizable material is selected from the class consisting of acrylic acid esters of alcohols having 1 to 20 carbon atoms, methacrylic acid esters of alcohols having 4 to 20 carbon atoms, and conjugated dienes having 4 to 6 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |