US2816561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure reducing valve
Assignee: Wallace O Leonard Inc
•
Filing: 1952-08-11
•
Granted: 1957-12-17
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Expires: 1972-08-11
Abstract
No abstract record available.
Inventors
- 👤 Rudolph E Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/0402; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2012; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7795; Y10T137/7809; Y10T137/781; Y10T137/7811; Y10T137/7822; Y10T137/7823; Y10T137/7826
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1842236A
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US1957972A
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US2050978A
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US2002884A
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US2174797A
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US2240846A
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US2270659A
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US2306060A
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US2508010A
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US2475086A
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US2642701A
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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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |