Patent US2663285A successfully refreshed from Google Patents.
US2663285A
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Lifting apparatus
Assignee: Mason Co
•
Filing: 1949-04-23
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Granted: 1953-12-22
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Expires: 1969-04-23
Abstract
No abstract record available.
Inventors
- 👤 Johnston Blaine
- 👤 John C Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:45
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/06; Y; Y10; Y10S; Y10S92/00; Y10S92/01; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32516
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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |