Patent US2539004A successfully refreshed from Google Patents.
US2539004A
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US
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Fluid circulation control for fluid couplings
Assignee: Atlas Polar Co Ltd
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Filing: 1947-04-25
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Granted: 1951-01-23
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Expires: 1967-04-25
Abstract
No abstract record available.
Inventors
- 👤 Becker John Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:41
CPC Classifications
F; F16; F16D; F16D33/00; F16D33/06; F16D33/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1882222A
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US1975505A
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US1987985A
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US2078597A
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US2050550A
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US2187069A
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US2265107A
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US2343786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |