US3170406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston engine
Assignee: Individual
•
Filing: 1962-11-28
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Granted: 1965-02-23
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Expires: 1982-11-28
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:41
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B71/045; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A FREE PISTON TYPE DEVICE COMPRISING A CHAMBER, A PISTON DISPOSED IN SAID CHAMBER, MEANS FOR URGING SAID PISTON TO MOVE FROM ONE EXTREME POSITION THEREOF IN A PREDETERMINED DIRECTION WITHIN SAID CHAMBER TOWARD THE OTHER EXTREME POSITION THEREOF, AN ADDITIONAL PISTON DISPOSED WITHIN SAID CHAMBER SPACED APART IN SAID PREDETERMINED DIRECTION FROM SAID PISTON, MEANS PERMANENTLY DISPOSED IN THE SPACE BETWEEN SAID PISTON AND SAID ADDITIONAL PISTON FOR ELASTICALLY TRANSMITTING AT LEAST A PORTION OF THE MOVEMENT OF SAID PISTON AND SAID ADDITIONAL PISTON TO ONE ANOTHER, AND MEANS URGING SAID ADDITIONAL PISTON IN RESPONSE TO THE MOVEMENT THEREOF TRANSMITTED FROM SAID PISTON FOR PROVIDING A RESTORING FORCE SUFFICIENT TO RETURN SAID ADDITIONAL PISTON AND THEREBY SAID PISTON OPPOSITE TO SAID PREDETERMINED DIRECTION TOWARD SAID ONE EXTREME POSITION.
Claim 2
Dependent Claim
129 words
A FREE PISTON TYPE DEVICE COMPRISING A CHAMBER, A PISTON DISPOSED IN SAID CHAMBER, MEANS FOR URGING SAID PISTON TO MOVE FROM ONE EXTREME POSITION THEREOF IN A PREDETERMINED DIRECTION WITHIN SAID CHAMBER TOWARD THE OTHER EXTREME POSITION THEREOF, AN ADDITIONAL PISTON DISPOSED WITHIN SAID CHAMBER SPACED APART IN SAID PREDETERMINED DIRECTION FROM SAID PISTON, MEANS PERMANENTLY DISPOSED IN THE SPACE BETWEEN SAID PISTON AND SAID ADDITIONAL PISTON FOR ELASTICALLY TRANSMITTING AT LEAST A PORTION OF THE MOVEMENT OF SAID PISTON AND SAID ADDITIONAL PISTON TO ONE ANOTHER, AND MEANS URGING SAID ADDITIONAL PISTON IN RESPONSE TO THE MOVEMENT THEREOF TRANSMITTED FROM SAID PISTON FOR PROVIDING A RESTORING FORCE SUFFICIENT TO RETURN SAID ADDITIONAL PISTON AND THEREBY SAID PISTON OPPOSITE TO SAID PREDETERMINED DIRECTION TOWARD SAID ONE EXTREME POSITION.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |