Patent US2501661A successfully refreshed from Google Patents.
US2501661A
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Apparatus and system for fluid control
Assignee: Individual
•
Filing: 1943-07-14
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Granted: 1950-03-28
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Expires: 1963-07-14
Abstract
No abstract record available.
Inventors
- 👤 Niels A Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:55
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/122; F16K31/124; F16K31/1245; B; B64; B64D; B64D37/00; B64D37/02; B64D37/14; B64D37/20; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/4807; Y10T137/4841; Y10T137/4857; Y10T137/8593
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US312158A
Cited
US1063975A
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US1329997A
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US1633483A
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US1726721A
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US1765090A
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US2084368A
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US2055347A
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US2146729A
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US2268957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |