US2474772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unloading valve
Assignee: Electrol Inc
•
Filing: 1943-11-24
•
Granted: 1949-06-28
•
Expires: 1963-11-24
Abstract
No abstract record available.
Inventors
- 👤 Benjamin N Ashton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:44
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/024; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/2625; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777; Y10T137/7781; Y10T137/7835
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US852802A
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US931798A
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US1077795A
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US1165616A
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US1205898A
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US1634672A
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US2264375A
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US2296145A
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US2316445A
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US2417242A
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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) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |