Patent US1777464A successfully refreshed from Google Patents.
US1777464A
Expired / Lapsed
US
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Rotary-valve mechanism
Assignee: ADDISON INVEST Co
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Filing: 1929-08-10
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Granted: 1930-10-07
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Expires: 1949-08-10
Abstract
No abstract record available.
Inventors
- 👤 William M Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:14
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/02; F01L7/021; F01L7/023
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) | 1933-10-06 | 1934-04-07 | 1934-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-06 | 1938-04-07 | 1938-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-06 | 1942-04-07 | 1942-10-07 | $7700.00 | Window Closed / Lapsed |