Patent US2564289A successfully refreshed from Google Patents.
US2564289A
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US
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Lift mechanism
Assignee: Walker Manufacturing Company of Wisconsin
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Filing: 1945-03-07
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Granted: 1951-08-14
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Expires: 1965-03-07
Abstract
No abstract record available.
Inventors
- 👤 Willard T Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/10; B66F7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |