Patent US2139989A successfully refreshed from Google Patents.
Patent US2837430A successfully refreshed from Google Patents.
US2837430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making dyed relief records
Assignee: Technicolor Corp
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Filing: 1955-07-12
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Granted: 1958-06-03
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Expires: 1975-07-12
Abstract
No abstract record available.
Inventors
- 👤 Richard J Goldberg
- 👤 Leon A Levinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:33
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/22; G03C7/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
FOR FORMING A DYED RELIEF RECORD FROM A COLLOID LAYER SENSITIZED WITH SILVER-HALIDE, THE METHOD WHICH COMPRISES EXPOSING THE LAYER TO FORM A LATENT IMAGE, DEVELOPING THE LAYER WITH A HARDENING DEVELOPER TO FORM A SILVER IMAGE AND HARDENING THE LAYER IN THE REGION OF THE DEVELOPED SILVER, ETCHING OFF THE UNHARDENED LAYER TO FORM A RELIEF RECORD, AND DYEING THE RELIEF RECORD, CHARACTERIZED BY USING A SOLUBLE THIOSULPHATE IN THE DEVELOPER TO PREVENT THE LAYER FROM BEING ETCHED ALL THE WAY THROUGH IN THE HIGHLIGHTS.
Claim 2
Dependent Claim
86 words
FOR FORMING A DYED RELIEF RECORD FROM A COLLOID LAYER SENSITIZED WITH SILVER-HALIDE, THE METHOD WHICH COMPRISES EXPOSING THE LAYER TO FORM A LATENT IMAGE, DEVELOPING THE LAYER WITH A HARDENING DEVELOPER TO FORM A SILVER IMAGE AND HARDENING THE LAYER IN THE REGION OF THE DEVELOPED SILVER, ETCHING OFF THE UNHARDENED LAYER TO FORM A RELIEF RECORD, AND DYEING THE RELIEF RECORD, CHARACTERIZED BY USING A SOLUBLE THIOSULPHATE IN THE DEVELOPER TO PREVENT THE LAYER FROM BEING ETCHED ALL THE WAY THROUGH IN THE HIGHLIGHTS.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |