US2706488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-back-flow device
Assignee: HERSEY MANUFACTURING Co
•
Filing: 1950-11-30
•
Granted: 1955-04-19
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Expires: 1970-11-30
Abstract
No abstract record available.
Inventors
- 👤 George H Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2617; Y10T137/2622; Y10T137/263; Y10T137/3149; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7822; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1720444A
Cited
US1725428A
Cited
US2310586A
Cited
GB586166A
Cited
US2491604A
Cited
US2503424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |