Patent US2477221A successfully refreshed from Google Patents.
US2477221A
Expired / Lapsed
US
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Ladder roller mounting
Assignee: YUBA Manufacturing Co
•
Filing: 1947-04-29
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Granted: 1949-07-26
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Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Bolhar Edgar Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:53
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/12; E02F3/14; E02F3/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1978939A
Cited
US2043725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |