US2920159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow prevention and alarm device
Assignee: Backflow Engineering & Equipme
•
Filing: 1956-12-03
•
Granted: 1960-01-05
•
Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Leonard L Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:47
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0025; F16K37/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US490684A
Cited
US1713833A
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US654631A
Cited
US1977498A
Cited
US1968648A
Cited
US2033084A
Cited
US2714168A
Cited
US2773251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |