US1827470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible check valve and cut-off
Assignee: Individual
•
Filing: 1928-01-17
•
Granted: 1931-10-13
•
Expires: 1948-01-17
Abstract
No abstract record available.
Inventors
- 👤 Charles D Harrison
- 👤 Parren D Lindsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:25
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/18; F16K15/184; F16K15/1848; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7911; Y10T137/8158; Y10T137/8175; Y10T137/8593; Y10T137/87265; Y10T137/87555; Y10T137/87563; Y10T137/87917; Y10T137/88054
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) | 1934-10-12 | 1935-04-13 | 1935-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-12 | 1939-04-13 | 1939-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-12 | 1943-04-13 | 1943-10-13 | $7700.00 | Window Closed / Lapsed |