US3674321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Captive air brake for vehicles
Assignee: Individual
•
Filing: 1970-06-29
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Granted: 1972-07-04
•
Expires: 1990-06-29
Abstract
Abstract A BRAKE SYSTEM CONSISTING OF AN EMBODIMENT IN WHICH A BRAKE-APPLYING MECHANISM IS NORMALLY MAINTAINED IN A POSITION OF BRAKE APPLICATION BY MEANS OF CAPTIVE AIR PRESSURE AND IN WHICH BRAKE RELEASE IS ATTAINED BY COUNTER AIR PRESSURE OF GREATER FORCE THAN THE CAPTIVE AIR PRESSURE. ANOTHER EMBODIMENT INVOLVES THE USE OF VACUUM FROM THE INTAKE MANIFOLD OF A VEHICLE MOTOR OR BY THE USE OF A VACUUM TANK AND A ONE-WAY CHECK VALVE, THE VACUUM CREATING A FORCE GREATER THAN THE FORCE OF THE CAPTIVE AIR, TO THEREBY CAUSE BRAKE RELEASE.
Inventors
- 👤 John Garfield Fontaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:39
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/28; B; B60; B60T; B60T11/00; B60T11/10; B60T11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |