US2491604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back siphonage prevention, antibackflow, and vacuum breaking valve
Assignee: Individual
•
Filing: 1943-06-22
•
Granted: 1949-12-20
•
Expires: 1963-06-22
Abstract
No abstract record available.
Inventors
- 👤 Carlton Frank
- 👤 Leonard L Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:56
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7781; Y10T137/7837; Y10T137/7898; Y10T137/7903; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7932
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT32593B
Cited
US1173518A
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US1755993A
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GB322993A
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US1960144A
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US2159056A
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US2117389A
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US2146204A
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US2310586A
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US2328007A
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US2328118A
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US2292871A
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US2389412A
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US2389413A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |