US2905487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double valve construction and the like
Assignee: Individual
•
Filing: 1956-07-20
•
Granted: 1959-09-22
•
Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Herbert E Schifter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:59
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6184; Y10T137/8593; Y10T137/86928; Y10T137/87016; Y10T137/8704; Y10T137/87917; Y10T137/88046; Y10T137/88062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2203922A
Cited
US1818124A
Cited
US1740015A
Cited
US2181758A
Cited
US2370182A
Cited
US2742052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |