Patent US1549969A successfully refreshed from Google Patents.
US1549969A
Expired / Lapsed
US
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Smooth-passage three-way valve for powdered material
Assignee: GRINDLE FUEL EQUIPMENT Co
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Filing: 1924-08-01
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Granted: 1925-08-18
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Expires: 1944-08-01
Abstract
No abstract record available.
Inventors
- 👤 Aubrey J Grindle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/08; F16K11/083; F16K11/0833; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86831; Y10T137/86863; Y10T137/86871
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) | 1928-08-17 | 1929-02-16 | 1929-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-17 | 1933-02-16 | 1933-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-17 | 1937-02-16 | 1937-08-18 | $7700.00 | Window Closed / Lapsed |