Patent US2852371A successfully refreshed from Google Patents.
US2852371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic duplicating process
Assignee: Eastman Kodak Co
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Filing: 1956-11-20
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Granted: 1958-09-16
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Expires: 1976-11-20
Abstract
No abstract record available.
Inventors
- 👤 William B Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A PHOTOGRAPHIC PROCESS FOR PREPARING A SPIRIT DUPLICATING MASTER WHICH COMPRISES EXPOSING TO A SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT TEMPORARILY ADHERED TO A PAPER SUPPORT, TREATING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO DEVELOP A TANNED GELATIN AND SILVER IMAGE IN THE EXPOSED REGION OF THE EMULSION LAYER AND TO LEAVE UNHARDENED GELATIN AND SILVER HALIDE IN THE LESS-EXPOSED AREAS OF THE EMULSION LAYER, PRESSING THE EMULSION LAYER WHILE MOIST INTO CONTACT WITH A SECOND SUPPORT, STRIPPING THE SUPPORTS APART, LEAVING THE EMULSION LAYER ADHERED TO THE SECOND SUPPORT, PRESSING THE ADHERED EMULSION LAYER WHILE STILL MOIST AGAINST AN ABSORBENT SURFACE TO TRANSFER A STRATUM OF THE UNHARDENED EMULSION AREAS TO THE ABSORBENT SURFACE, AND THEN PRESSING SAID STRATUM AGAINST THE SURFACE OF A SPIRIT DUPLICATING MASTER SHEET TO TRANSFER PORTIONS OF SAID LAST-MENTIONED SURFACE TO SAID STRATUM.
Claim 2
Dependent Claim
151 words
A PHOTOGRAPHIC PROCESS FOR PREPARING A SPIRIT DUPLICATING MASTER WHICH COMPRISES EXPOSING TO A SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT TEMPORARILY ADHERED TO A PAPER SUPPORT, TREATING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO DEVELOP A TANNED GELATIN AND SILVER IMAGE IN THE EXPOSED REGION OF THE EMULSION LAYER AND TO LEAVE UNHARDENED GELATIN AND SILVER HALIDE IN THE LESS-EXPOSED AREAS OF THE EMULSION LAYER, PRESSING THE EMULSION LAYER WHILE MOIST INTO CONTACT WITH A SECOND SUPPORT, STRIPPING THE SUPPORTS APART, LEAVING THE EMULSION LAYER ADHERED TO THE SECOND SUPPORT, PRESSING THE ADHERED EMULSION LAYER WHILE STILL MOIST AGAINST AN ABSORBENT SURFACE TO TRANSFER A STRATUM OF THE UNHARDENED EMULSION AREAS TO THE ABSORBENT SURFACE, AND THEN PRESSING SAID STRATUM AGAINST THE SURFACE OF A SPIRIT DUPLICATING MASTER SHEET TO TRANSFER PORTIONS OF SAID LAST-MENTIONED SURFACE TO SAID STRATUM.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |