US2694634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making models in relief in gelatine by photographic processes
Assignee: Geographical Projects Ltd
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Filing: 1949-06-14
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Granted: 1954-11-16
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Expires: 1969-06-14
Abstract
No abstract record available.
Inventors
- 👤 Debenham Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
145 words
IN A PROCESS OF PRODUCING MAPS SHOWING DETAILS OF BOTH THE HORIZONAL AND THE VERTICAL DIMENSIONS OF A TERRAIN, THE STEP SO PROVIDING A MAP SHOWING SUCCESSIVE CONTOUR LEVELS, MAKING A SEPARATE IMAGE RECORD ON SHEET MATERIAL OF THE OUTLINE OF EACH OF SELECTED CONTOUR LEVELS OF THE TERRAIN, EACH OF SAID IMAGE RECORDS HAVING A LIGHT-CONTRAST BETWEEN AREAS ABOVE AND AREAS BELOW THE CONTOUR LEVEL REPRESENTED BY THE RESPECTIVE IMAGE RECORD, PHOTOGRAPHICALLY REPRODUCING EACH OF SAID IMAGE RECORDS ON A SHEET OF GELATINOUS MATERIAL SENSITIZED SO THAT THE SOLUBILITY OF THE GELATINOUS MATERIAL VARIES WITH EXPOSURE TO LIGHT, REMOVING THE MORE SOLUBLE GELATINOUS MATERIAL SO THAT THE AREA OF THE GELATINOUS SHEET ON ONE SIDE OF THE CONTOUR OUTLINE IS THICKER THAN ON THE OPPOSITE SIDE, AND SUPERPOSING SAID GELATINOUS SHEETS IN REGISTRATION WITH ONE ANOTHER TO FORM A RELIEF REPRESENTATION OF SAID TERRAIN.
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) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |