US3301240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve lifter
Assignee: Individual
•
Filing: 1965-07-02
•
Granted: 1967-01-31
•
Expires: 1985-07-02
Abstract
No abstract record available.
Inventors
- 👤 Miroslaw J Peresada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:03
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A HYDRAULIC VALVE LIFTER FOR USE IN INTERNAL COMBUSTION ENGINES COMPRISING A SINTERED CYLINDRICAL OUTER PISTON HAVING A CLOSED FORWARD END, AN OPEN REARWARD END FROM WHICH A CYLINDRICAL BORE EXTENDS FORWARDLY INTO THE OUTER PISTON, A CYLINDRICAL INNER PISTON FITTING SNUGLY BUT SLIDABLY WITHIN SAID CYLINDRICAL BORE, THE INNER PISTON HAVING A FORWARD END ADJACENT THE CLOSED FORWARD END OF THE OUTER PISTON AND A REARWARDLY EXTENDING CYLINDRICAL SIDE WALL, THE INNER PISTON BEING OF SINTERED METAL CONSTRUCTION AND IMPREGNATED SUBSTANTIALLY THROUGHOUT WITH A SEALANT IN ORDER TO MAKE IT IMPERVIOUS TO FLUID FLOW, THE OUTER PISTON BEING MADE IMPERVIOUS TO FLUID FLOW BETWEEN ITS CLOSED FORWARD END AND THE FORWARD END OF THE INNER PISTON, THE REMAINDER OF THE OUTER PISTON BEING PERVIOUS TO FLUID FLOW.
Claim 2
Dependent Claim
128 words
A HYDRAULIC VALVE LIFTER FOR USE IN INTERNAL COMBUSTION ENGINES COMPRISING A SINTERED CYLINDRICAL OUTER PISTON HAVING A CLOSED FORWARD END, AN OPEN REARWARD END FROM WHICH A CYLINDRICAL BORE EXTENDS FORWARDLY INTO THE OUTER PISTON, A CYLINDRICAL INNER PISTON FITTING SNUGLY BUT SLIDABLY WITHIN SAID CYLINDRICAL BORE, THE INNER PISTON HAVING A FORWARD END ADJACENT THE CLOSED FORWARD END OF THE OUTER PISTON AND A REARWARDLY EXTENDING CYLINDRICAL SIDE WALL, THE INNER PISTON BEING OF SINTERED METAL CONSTRUCTION AND IMPREGNATED SUBSTANTIALLY THROUGHOUT WITH A SEALANT IN ORDER TO MAKE IT IMPERVIOUS TO FLUID FLOW, THE OUTER PISTON BEING MADE IMPERVIOUS TO FLUID FLOW BETWEEN ITS CLOSED FORWARD END AND THE FORWARD END OF THE INNER PISTON, THE REMAINDER OF THE OUTER PISTON BEING PERVIOUS TO FLUID FLOW.
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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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |