Patent US2811443A successfully refreshed from Google Patents.
US2811443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic reproduction process using light sensitive polymeric stilbazoles and quaternary salts thereof
Assignee: Eastman Kodak Co
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Filing: 1955-09-15
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Granted: 1957-10-29
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Earl M Robertson
- 👤 Cornelius C Unruh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0388
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING A SUPPORTED LAYER OF A LIGHT SENSITIVE POLYMER SELECTED FROM THE GROUP CONSISTING OF A C-VINYLPYRIDINE QUATERNARY SALT POLYMER CONSISTING ESSENTIALLY OF THE RECURRING STRUCTURAL UNIT:
Claim 2
Dependent Claim
33 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING A SUPPORTED LAYER OF A LIGHT SENSITIVE POLYMER SELECTED FROM THE GROUP CONSISTING OF A C-VINYLPYRIDINE QUATERNARY SALT POLYMER CONSISTING ESSENTIALLY OF THE RECURRING STRUCTURAL UNIT:
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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |