US3333642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter blade or blade spar construction
Assignee: RTX Corp
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Filing: 1965-07-26
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Granted: 1967-08-01
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Expires: 1985-07-26
Abstract
No abstract record available.
Inventors
- 👤 Robert M Kee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:00
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN A HELICOPTER ROTOR BLADE ADAPTED TO BE CONNECTED TO A BLADE ROOT ATTACHMENT MEANS AND HAVING A LEADING EDGE, A TRAILING EDGE, A ROOT AND A TIP, A STRUCTURAL MEMBER EXTENDING SPANWISE FROM THE BLADE ROOT TO THE BLADE TIP, SAID STRUCTURAL MEMBER HAVING AT LEAST THREE LOAD CARRYING MEMBERS EXTENDING THROUGHTOUT THE BLADE SPAN AND EACH ADAPTED TO BE CONNECTED DIRECTLY TO SAID BLADE ROOT ATTACHMENT MEANS AND INCLUDING A FIRST MEMBER EXTENDING ALONG THE BLADE LEADING EDGE AND SHAPED TO PRESENT TWO SUBSTANTIALLY FLAT SURFACES, A SECOND MEMBER POSITIONED BETWEEN SAID FIRST MEMBER AND SAID BLADE TRAILING
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |