US2492781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the development of prints by means of ammonia gas
Assignee: Individual
•
Filing: 1945-10-24
•
Granted: 1949-12-27
•
Expires: 1965-10-24
Abstract
No abstract record available.
Inventors
- 👤 Berggren Kurt Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
G; G03; G03D; G03D7/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87619; Y10T137/87627; Y10T137/87652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US424118A
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US1878279A
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US1759484A
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US1886596A
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US1994735A
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US1926322A
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US1904551A
Cited
DE664373C
Cited
US2200996A
Cited
US2379932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |