Patent US2772790A successfully refreshed from Google Patents.
US2772790A
Expired / Lapsed
US
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Variable length boom extension
Assignee: Individual
•
Filing: 1955-05-09
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Granted: 1956-12-04
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Expires: 1975-05-09
Abstract
No abstract record available.
Inventors
- 👤 Roy D Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:26
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/66
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |