US2773251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow prevention and alarm device
Assignee: Backflow Engineering & Equipme
•
Filing: 1952-11-24
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Granted: 1956-12-04
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Expires: 1972-11-24
Abstract
No abstract record available.
Inventors
- 👤 Leonard L Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:32
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/104; E03C1/108; F; F16; F16K; F16K37/00; F16K37/0066; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US358949A
Cited
US1125407A
Cited
US1940346A
Cited
US2200310A
Cited
US2320368A
Cited
US2430122A
Cited
US2497375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |