Patent US3252620A successfully refreshed from Google Patents.
US2874642A
Expired / Lapsed
US
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Adjustable bypass valve
Assignee: Allis Chalmers Corp
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Filing: 1955-10-05
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Granted: 1959-02-24
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Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Frank R Forrest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0027; F04D15/0033; F04D29/00; F04D29/04; F04D29/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE326866C
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US1556771A
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US1846379A
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DE494649C
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US2265940A
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US2239152A
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US2555686A
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DE808796C
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US2786420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |