US1551697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring for checks and valves
Assignee: Individual
•
Filing: 1922-08-31
•
Granted: 1925-09-01
•
Expires: 1942-08-31
Abstract
No abstract record available.
Inventors
- 👤 Maurice F Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:54
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/06; F16K15/063; F16K17/00; F16K17/02; F16K17/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7862; Y10T137/7865; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7936
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) | 1928-08-31 | 1929-03-02 | 1929-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-31 | 1933-03-02 | 1933-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-31 | 1937-03-02 | 1937-09-01 | $7700.00 | Window Closed / Lapsed |