US3053278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double check valve for standpipe use
Assignee: Individual
•
Filing: 1959-06-11
•
Granted: 1962-09-11
•
Expires: 1979-06-11
Abstract
No abstract record available.
Inventors
- 👤 Maarten M Verheul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:37
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B21/106; F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/14; F16K15/144; F16K15/147; F16K15/1471; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/88062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US677687A
Cited
US1344383A
Cited
US1483081A
Cited
US1699095A
Cited
US2274776A
Cited
US2533921A
Cited
US2756017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |