Patent US3134445A successfully refreshed from Google Patents.
US3134445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade inspection system
Assignee: RTX Corp
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Filing: 1962-05-31
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Granted: 1964-05-26
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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 08:57
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.
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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) | 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 |