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Patent US2638829A successfully refreshed from Google Patents.
US2638829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus
Assignee: Individual
•
Filing: 1950-05-05
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Granted: 1953-05-19
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Expires: 1970-05-05
Abstract
No abstract record available.
Inventors
- 👤 Alexander J Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:08
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/02; G03D13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US729003A
Cited
GB190800031A
Cited
DE545388C
Cited
DE590793C
Cited
US2191508A
Cited
US2187948A
Cited
GB560005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |