US3173790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emusions containing polyoxyalkylene sensitizers
Assignee: GAF Chemicals Corp
•
Filing: 1962-09-19
•
Granted: 1965-03-16
•
Expires: 1982-09-19
Abstract
No abstract record available.
Inventors
- 👤 Dersch Fritz
- 👤 Jr William A Wurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
IN A PHOTOGRAPHIC ELEMENT A LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER HAVING IN INTIMATE CONTACT THEREWITH A CONDENSATION PRODUCT OF PENTAERYTHRITOL WITH 1,2PROPYLENE OXIDE, SUCH CONDENSATION PRODUCT HAVING A MOLECULAR WEIGHT OF AT LEAST 30.
Claim 2
Dependent Claim
34 words
IN A PHOTOGRAPHIC ELEMENT A LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER HAVING IN INTIMATE CONTACT THEREWITH A CONDENSATION PRODUCT OF PENTAERYTHRITOL WITH 1,2PROPYLENE OXIDE, SUCH CONDENSATION PRODUCT HAVING A MOLECULAR WEIGHT OF AT LEAST 30.
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |