US3139010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake plunger and method of making same
Assignee: Resinoid Engineering Corp
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Filing: 1961-08-08
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Granted: 1964-06-30
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Expires: 1981-08-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:10
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PISTON FOR A HYDRAULIC DEVICE HAVING AN INTERNAL PISTON RECEIVING BORE SUCH AS A BRAKE CYLINDER OR THE LIKE, COMPRISING: A MOLDED BODY OF SUBSTANTIALLY NONRESILIENT PLASTIC MATERIAL; AND A METAL HEAD INTEGRAL WITH SAID BODY, SAID HEAD BEING PRODUCED FROM A METAL CAPABLE OF TAKING A PERMANENT SET AND SAID HEAD HAVING BEEN PRESTRESSED AN AMOUNT TO PROVIDE A PERMANENT SET AT A STRESS LESS THAN MAXIMUM TENSILE STRENGTH OF THE METAL.
Claim 2
Dependent Claim
74 words
A PISTON FOR A HYDRAULIC DEVICE HAVING AN INTERNAL PISTON RECEIVING BORE SUCH AS A BRAKE CYLINDER OR THE LIKE, COMPRISING: A MOLDED BODY OF SUBSTANTIALLY NONRESILIENT PLASTIC MATERIAL; AND A METAL HEAD INTEGRAL WITH SAID BODY, SAID HEAD BEING PRODUCED FROM A METAL CAPABLE OF TAKING A PERMANENT SET AND SAID HEAD HAVING BEEN PRESTRESSED AN AMOUNT TO PROVIDE A PERMANENT SET AT A STRESS LESS THAN MAXIMUM TENSILE STRENGTH OF THE METAL.
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |