US3237697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor blade
Assignee: Boeing Co
•
Filing: 1963-02-11
•
Granted: 1966-03-01
•
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 07:48
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.
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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) | 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 |