US2698238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic product and process
Assignee: Polaroid Corp
•
Filing: 1947-02-08
•
Granted: 1954-12-28
•
Expires: 1967-02-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:50
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
THE PROCESS OF FORMING POSITIVE IMAGES IN SILVER WHICH COMPRISES DEVELOPING A LATENT NEGATIVE IMAGE IN A SILVER HALIDE LAYER, REACTING A SILVER HALIDE SOLVENT WITH PART AT LEAST OF THE UNDEVELOPED SILVER HALIDE OF SAID LAYER TO FORM AN IMAGEWISE DISTRIBUTION OF SOLUBLE SILVER COMPLEX IN SAID LAYER, TRANSFERRING, IN SOLUTION, AT LEAST PART OF SAID IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX TO AN IMAGE-RECEIVING MATERIAL SO LOCATED IN RELATION TO SAID SILVER HALIDE LAYER AS TO RECEIVE THE SOLUTION OF SAID COMPLEX WITHOUT APPRECIABLY DISTRUBING THE IMAGEWISE DISTRIBUTION THEREOF, AND REDUCING TO SILVER THE SILVER IONS OF SAID SOLUBLE COMPLEX IN THE PRESENCE OF LEAD SULFIDE WHICH IS DISPERSED IN SAID PRINT-RECEIVING MATERIAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |