US3173490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller blade for vtol aircraft
Assignee: Hiller Aircraft Co Inc
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Filing: 1962-07-25
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Granted: 1965-03-16
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Expires: 1982-07-25
Abstract
No abstract record available.
Inventors
- 👤 Iii Joseph Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0091; B64C11/00; B64C11/16; B64C11/18; B64C29/0008; B64C29/0016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A LOW TWIST ANGLE PROPELLER BLADE FOR A VTOL AIRCRAFT HAVING AN INBOARD PORTION, AN OUTBOARD PORTION, AND AN INTERMEDIATE TRANSITIONAL PORTION BETWEEN AND CONNECTING SAID INBOARD AND OUTBOARD PORTIONS, SAID INBOARD PORTION EXTENDING TO A FIRST PREDETERMINED LOCATION LYING WITHIN THE RANGE OF .4 TO .55 THE EFFECTIVE LENGTH OF SUCH BLADE AND INTRANSVERSE CROSS-SECTIONAL CONFIGURATION BEING GENERALLY SYMMETRICAL AND WITH A GENERALLY ZERO DESIGN LIFT COEFFICIENT, SAID OUTBOARD PORTION IN TRANSVERSE CROSS-SECTIONAL CONFIGURATION BEING NON-SYMMETRICAL AND HAVING A SUBSTANTIAL DESIGN LIFT COEFFICIENT SUBSTANTIALLY TO THE TIP OF SAID BLADE, THE TRANSVERSE CROSS-SECTIONAL CONFIGURATION OF SAID BLADE IN SAID INTERMEDIATE POINT CHANGING RELA-
Claim 2
Dependent Claim
104 words
A LOW TWIST ANGLE PROPELLER BLADE FOR A VTOL AIRCRAFT HAVING AN INBOARD PORTION, AN OUTBOARD PORTION, AND AN INTERMEDIATE TRANSITIONAL PORTION BETWEEN AND CONNECTING SAID INBOARD AND OUTBOARD PORTIONS, SAID INBOARD PORTION EXTENDING TO A FIRST PREDETERMINED LOCATION LYING WITHIN THE RANGE OF .4 TO .55 THE EFFECTIVE LENGTH OF SUCH BLADE AND INTRANSVERSE CROSS-SECTIONAL CONFIGURATION BEING GENERALLY SYMMETRICAL AND WITH A GENERALLY ZERO DESIGN LIFT COEFFICIENT, SAID OUTBOARD PORTION IN TRANSVERSE CROSS-SECTIONAL CONFIGURATION BEING NON-SYMMETRICAL AND HAVING A SUBSTANTIAL DESIGN LIFT COEFFICIENT SUBSTANTIALLY TO THE TIP OF SAID BLADE, THE TRANSVERSE CROSS-SECTIONAL CONFIGURATION OF SAID BLADE IN SAID INTERMEDIATE POINT CHANGING RELA-
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |