US2456942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission for helicopter rotors
Assignee: Worcester Polytechnic Institute
•
Filing: 1944-01-26
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Granted: 1948-12-21
•
Expires: 1964-01-26
Abstract
No abstract record available.
Inventors
- 👤 John A Holbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US829128A
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US1744637A
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US1817542A
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US1994488A
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US1870649A
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US2121663A
Cited
US2237297A
Cited
US2317340A
Cited
US2340241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |