Patent US2706490A successfully refreshed from Google Patents.
US2706490A
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US
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Variable retraction valve
Assignee: Nordberg Manufacturing Co
•
Filing: 1950-01-18
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Granted: 1955-04-19
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Expires: 1970-01-18
Abstract
No abstract record available.
Inventors
- 👤 Grieshaber Emil
- 👤 Froehlich Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:35
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/46; F02M59/462; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/7867
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1139646A
Cited
FR576317A
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FR609878A
Cited
DE493909C
Cited
US1730322A
Cited
US2090781A
Cited
US2090688A
Cited
US2163313A
Cited
US2327574A
Cited
US2612841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |