Patent US3115831A successfully refreshed from Google Patents.
US3115831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible rotochute
Assignee: Individual
•
Filing: 1961-09-26
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Granted: 1963-12-31
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Expires: 1981-09-26
Abstract
No abstract record available.
Inventors
- 👤 Suter Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:05
CPC Classifications
F; F42; F42B; F42B10/00; F42B10/32; F42B10/48; F42B10/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A PROJECTILE CAPABLE OF BEING LAUNCHED AT A RELATIVELY HIGH INITIAL VELOCITY AND RETARDED TO A RELATIVELY LOW TERMINAL VELOCITY COMPRISING: AN ELONGATED CYLINDRICAL CASING STREAMLINED FOR AERODYNAMIC STABILITY, THE LONGITUDINAL AXIS OF SAID CASING BEING THE AXIS OF ROTATION OF SAID PROJECTILE, A PLURALITY OF NORMALLY FLAT PARALLEL BLADES CONTIGUOUSLY WRAPPED AROUND SAID CASING IN HELICAL RELATION TO SAID AXIS OF ROTATION, SAID BLADES BEING UNIVERSALLY FLEXIBLE THROUGHOUT THEIR LENGTHS, MEANS FOR RIGIDLY SECURING THE REARWARDLY DISPOSED ENDS OF SAID BLADES ADJACENT TO THE POSTERIOR END OF SAID CASING ON A SURFACE INCLINED TRANSVERSELY TO THE AXIS OF ROTATION OF SAID PORJECTILE, THE ANGLE OF INCLINATION DETERMINING THE ROOT PITCH OF SAID BLADES; WHEREBY SAID BLADES DEVELOP TORQUE ABOUT SAID AXIS OF ROTATION WHEN DEFLECTED REARWARDLY ABOUT THEIR SECURED ENDS BY AIRFLOW, AND GRADUALLY MOVE RADIALLY OUTWARD DUE TO CENTRIFUGAL FORCES PRODUCED BY THE ROTATION OF SAID BLADES TO DEVELOP LIFT.
Claim 2
Dependent Claim
152 words
A PROJECTILE CAPABLE OF BEING LAUNCHED AT A RELATIVELY HIGH INITIAL VELOCITY AND RETARDED TO A RELATIVELY LOW TERMINAL VELOCITY COMPRISING: AN ELONGATED CYLINDRICAL CASING STREAMLINED FOR AERODYNAMIC STABILITY, THE LONGITUDINAL AXIS OF SAID CASING BEING THE AXIS OF ROTATION OF SAID PROJECTILE, A PLURALITY OF NORMALLY FLAT PARALLEL BLADES CONTIGUOUSLY WRAPPED AROUND SAID CASING IN HELICAL RELATION TO SAID AXIS OF ROTATION, SAID BLADES BEING UNIVERSALLY FLEXIBLE THROUGHOUT THEIR LENGTHS, MEANS FOR RIGIDLY SECURING THE REARWARDLY DISPOSED ENDS OF SAID BLADES ADJACENT TO THE POSTERIOR END OF SAID CASING ON A SURFACE INCLINED TRANSVERSELY TO THE AXIS OF ROTATION OF SAID PORJECTILE, THE ANGLE OF INCLINATION DETERMINING THE ROOT PITCH OF SAID BLADES; WHEREBY SAID BLADES DEVELOP TORQUE ABOUT SAID AXIS OF ROTATION WHEN DEFLECTED REARWARDLY ABOUT THEIR SECURED ENDS BY AIRFLOW, AND GRADUALLY MOVE RADIALLY OUTWARD DUE TO CENTRIFUGAL FORCES PRODUCED BY THE ROTATION OF SAID BLADES TO DEVELOP LIFT.
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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) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |