US2639675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic boiler feed
Assignee: Individual
•
Filing: 1946-11-18
•
Granted: 1953-05-26
•
Expires: 1966-11-18
Abstract
No abstract record available.
Inventors
- 👤 Philip H Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:18
CPC Classifications
F; F22; F22D; F22D11/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/2947; Y10T137/2965
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US64347A
Cited
US134972A
Cited
US404346A
Cited
US1183093A
Cited
DE388671C
Cited
GB477870A
Cited
US2131335A
Cited
US2325241A
Cited
US2412775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |