Patent US2533980A successfully refreshed from Google Patents.
US2533980A
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US
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Lifting and lowering appliance
Assignee: WEAVER ENGINEERING Co
•
Filing: 1946-01-04
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Granted: 1950-12-12
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Expires: 1966-01-04
Abstract
No abstract record available.
Inventors
- 👤 Ira A Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:41
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/0691; B66F7/0625; B66F7/065; B66F7/0666; B66F7/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |