US3478778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clapper valve with changing bias
Assignee: HERSEY SPARLING METER CO
•
Filing: 1967-05-25
•
Granted: 1969-11-18
•
Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Alan Clarkson Curtiss
- 👤 Roger Williams Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/033; F16K15/035; F16K2200/00; F16K2200/20; F16K2200/204; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7901; Y10T137/7904; Y10T137/7906; Y10T137/7907
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB532241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |