Patent US786396A successfully refreshed from Google Patents.
US2819166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-processing photostat paper
Assignee: Individual
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Filing: 1954-06-23
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Granted: 1958-01-07
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Expires: 1974-06-23
Abstract
No abstract record available.
Inventors
- 👤 Max H Goldschein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A LAMINATED SELF-PROCESSING PHOTOPRINT PAPER, COMPRISING A PAPER BASE LAYER READILY WATER ABSORPTIVE AND COATED WITH A GELATIN EMULSION OF SILVER HALIDE, AN OUTER LAYER OF GELATIN HARDENED WITH ALUM AND SUBSTANTIALLY WATER IMPERVIOUS, A PROTECTIVE COATING OF GELATIN HARDENED WITH A LESSER AMOUNT OF ALUM DISPOSED UPON THE SILVER HALIDE AND BEING LESS WATER PERMEABLE THAN THE PAPER BASE LAYER AND MORE READILY WATER PERMEABLE THAN THE OUTER LAYER, A LAYER OF DRY WATER SOLUBLE DEVELOPER FOR THE SILVER HALIDE CARRIED BY THE PAPER BASE LAYER, AND A LAYER OF DRY WATER SOLUBLE GELATIN EMULSION OF FIX FOR THE SILVER HALIDE DISPOSED BETWEEN THE PROTECTIVE COATING AND THE OUTER LAYER, WHEREBY WHEN THE LAMINATED SHEET IS IMMERSED IN WATER THE WATER IS ABSORBED INWARDLY FROM THE PAPER SIDE OF THE SHEET ONLY WITH A TIME DELAY FOR EFFECTING SOLUTION OF THE FIX LAYER WITH RESPECT TO THE DEVELOPER LAYER.
Claim 2
Dependent Claim
150 words
A LAMINATED SELF-PROCESSING PHOTOPRINT PAPER, COMPRISING A PAPER BASE LAYER READILY WATER ABSORPTIVE AND COATED WITH A GELATIN EMULSION OF SILVER HALIDE, AN OUTER LAYER OF GELATIN HARDENED WITH ALUM AND SUBSTANTIALLY WATER IMPERVIOUS, A PROTECTIVE COATING OF GELATIN HARDENED WITH A LESSER AMOUNT OF ALUM DISPOSED UPON THE SILVER HALIDE AND BEING LESS WATER PERMEABLE THAN THE PAPER BASE LAYER AND MORE READILY WATER PERMEABLE THAN THE OUTER LAYER, A LAYER OF DRY WATER SOLUBLE DEVELOPER FOR THE SILVER HALIDE CARRIED BY THE PAPER BASE LAYER, AND A LAYER OF DRY WATER SOLUBLE GELATIN EMULSION OF FIX FOR THE SILVER HALIDE DISPOSED BETWEEN THE PROTECTIVE COATING AND THE OUTER LAYER, WHEREBY WHEN THE LAMINATED SHEET IS IMMERSED IN WATER THE WATER IS ABSORBED INWARDLY FROM THE PAPER SIDE OF THE SHEET ONLY WITH A TIME DELAY FOR EFFECTING SOLUTION OF THE FIX LAYER WITH RESPECT TO THE DEVELOPER LAYER.
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |