US3134445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade inspection system
Assignee: RTX Corp
•
Filing: 1962-05-31
•
Granted: 1964-05-26
•
Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Hotchkiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:30
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/006; B64C27/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN COMBINATION IN A HELICOPTER, (A) A FUSELAGE, (B) A ROTOR HEAD MOUNTED THEREON FOR ROTATION, (C) TWO BLADES ATTACHED TO SAID ROTOR HEAD, (D) EACH OF SAID BLADES HAVING A PRESSURIZED SECTION THEREIN, (E) EACH SECTION BEING PRESSURIZED TO APPROXIMATELY THE SAME VALUE, AND (F) A PRESSURE DIFFERENTIAL INDICATOR BEING CONNECTED BETWEEN THE PRESSURIZED SECTION OF EACH OF SAID PRESSURIZED BLADES.
Claim 2
Dependent Claim
62 words
IN COMBINATION IN A HELICOPTER, (A) A FUSELAGE, (B) A ROTOR HEAD MOUNTED THEREON FOR ROTATION, (C) TWO BLADES ATTACHED TO SAID ROTOR HEAD, (D) EACH OF SAID BLADES HAVING A PRESSURIZED SECTION THEREIN, (E) EACH SECTION BEING PRESSURIZED TO APPROXIMATELY THE SAME VALUE, AND (F) A PRESSURE DIFFERENTIAL INDICATOR BEING CONNECTED BETWEEN THE PRESSURIZED SECTION OF EACH OF SAID PRESSURIZED BLADES.
References Cited (Backward Citations)
US2706463A
Cited
US1173038A
Cited
US1720934A
Cited
US2405022A
Cited
US2702053A
Cited
US2754917A
Cited
US2665580A
Cited
US2999386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |