Patent US3905375A successfully refreshed from Google Patents.
Patent US1857477A successfully refreshed from Google Patents.
US1857477A
Expired / Lapsed
US
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Valve construction
Assignee: Tillotson Manufacturing Co
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Filing: 1928-05-23
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Granted: 1932-05-10
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Expires: 1948-05-23
Abstract
No abstract record available.
Inventors
- 👤 George F Ritter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
F; F02; F02M; F02M1/00; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-05-10 | 1935-11-09 | 1936-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-10 | 1939-11-09 | 1940-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-10 | 1943-11-09 | 1944-05-10 | $7700.00 | Window Closed / Lapsed |