Patent US2550801A successfully refreshed from Google Patents.
US2550801A
Expired / Lapsed
US
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Automatic lock for hoisting mechanisms
Assignee: Holland USA Inc
•
Filing: 1949-04-04
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Granted: 1951-05-01
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Expires: 1969-04-04
Abstract
No abstract record available.
Inventors
- 👤 Henry A Geerds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:04
CPC Classifications
B; B60; B60S; B60S9/00; B60S9/14; B60S9/16; B60D; B60D1/00; B60D1/58; B60D1/66; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US771490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |