US3605556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Booster pump
Assignee: TDK Micronas GmbH
•
Filing: 1969-10-14
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Granted: 1971-09-20
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Expires: 1989-10-14
Abstract
Abstract A RECIROCATING PLUNGER PUMP FOR USE AS A BOOSTER IN POWER ASSISTED BRAKES IN WHICH A PUMP ACTUATOR DIRECTLY COUPLED TO THE PUMP IS DRIVEN BY THE DIFFERENCE BETWEEN ATMOSPHERIC PRESSURE AND ENGINE VACUUM ACTING ACROSS A PISTON WHICH IS SEALED BY A ROLLING MEMBRANE. THE ACTUATOR MAY HAVE A REVERSING VALVE IN THE PISTON WHICH AUTOMATICALLY SWITCHES THE PRESSURE ON ONE SIDE OF THE PISTON BETWEEN THE ATMOSPHERIC AND ENGINE VACUUM PRESSURE AT THE END OF EACH STROKE WHILE MAINTAINING THE OTHER SIDE AT ATMOSPHERIC PRESSURE TO CAUSE THE PISTON TO OSCILLATE. A SPRING ACTS AGAINST THE ATMOSPHERIC PRESSURE ON THE PISTON.
Inventors
- 👤 Hans Erdmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/168
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |