Patent US3237697A successfully refreshed from Google Patents.
US3237697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor blade
Assignee: Boeing Co
•
Filing: 1963-02-11
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Granted: 1966-03-01
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Expires: 1983-02-11
Abstract
No abstract record available.
Inventors
- 👤 Robert J Ford
- 👤 Tarczynski Tadensz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:44
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B29C; B29C70/00; B29C70/68; B29C70/86; B29D24/00; B29D24/002; B29D24/005; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101; B29K2105/108; B29L; B29L2031/00; B29L2031/30; B29L2031/3047; B64C2027/4733; B64C2027/4736
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A STRUCTURE OF AIRFOIL COUNTOUR, A LONGITUDINALLY EXTENDING ROTOR SPAR ASSEMBLY HAVING AN INBOARD CONNECTING END PORTION OF GENERALLY ELONGATED CYLINDRICAL CONFIGURATION, A FIRST SERIES OF PLIES OF REINFORCED PLASTIC MATERIAL ARRANGED IN SURROUNDING RELATION TO SAID CONNECTING END PORTION AND POSITIONED IN BIASED RELATION TO ASBORB TORSIONAL FORCES, AND A SECOND SERIES OF PLIES ARRANGED IN SURROUNDING RELATION TO SAID FIRST SERIES OF PLIES AND EXTENDING LONGITUDINALLY OUTWARDLY FROM SAID CONNECTING END PORTION ALONG THE LENGTH OF SAID STRUCTURE, SAID LONGITUDINALLY EXTENDING SERIES OF PLIES BEING REINFORCED WITH UNIDIRECTIONAL AND LONGITUDINALLY EXTENDING NON-WOVEN FILAMENTS TO ABSORB CENTRIFUGAL FORCES IMPARTED TO SAID STRUCTURE.
Claim 2
Dependent Claim
104 words
IN A STRUCTURE OF AIRFOIL COUNTOUR, A LONGITUDINALLY EXTENDING ROTOR SPAR ASSEMBLY HAVING AN INBOARD CONNECTING END PORTION OF GENERALLY ELONGATED CYLINDRICAL CONFIGURATION, A FIRST SERIES OF PLIES OF REINFORCED PLASTIC MATERIAL ARRANGED IN SURROUNDING RELATION TO SAID CONNECTING END PORTION AND POSITIONED IN BIASED RELATION TO ASBORB TORSIONAL FORCES, AND A SECOND SERIES OF PLIES ARRANGED IN SURROUNDING RELATION TO SAID FIRST SERIES OF PLIES AND EXTENDING LONGITUDINALLY OUTWARDLY FROM SAID CONNECTING END PORTION ALONG THE LENGTH OF SAID STRUCTURE, SAID LONGITUDINALLY EXTENDING SERIES OF PLIES BEING REINFORCED WITH UNIDIRECTIONAL AND LONGITUDINALLY EXTENDING NON-WOVEN FILAMENTS TO ABSORB CENTRIFUGAL FORCES IMPARTED TO SAID STRUCTURE.
References Cited (Backward Citations)
US2202013A
Cited
US2303707A
Cited
GB596636A
Cited
US2621140A
Cited
US2588570A
Cited
US2674327A
Cited
US2659444A
Cited
US2954828A
Cited
US3018832A
Cited
US2941603A
Cited
US3004607A
Cited
GB871625A
Cited
GB831380A
Cited
US3021246A
Cited
US2951541A
Cited
GB836501A
Cited
US3028292A
Cited
US3055437A
Cited
GB880425A
Cited
US3000446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |