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Patent US2568897A successfully refreshed from Google Patents.
US2568897A
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Assignee: Allis Chalmers Corp
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Filing: 1947-10-23
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Granted: 1951-09-25
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Expires: 1967-10-23
Abstract
No abstract record available.
Inventors
- 👤 Emil F Norelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:11
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1930312A
Cited
US2203525A
Cited
DE700323C
Cited
US2222779A
Cited
US2283871A
Cited
US2408215A
Cited
US2403298A
Cited
US2402995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |