Patent US3722483A successfully refreshed from Google Patents.
US3722483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic valve closing mechanism
Assignee: Individual
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Filing: 1969-11-10
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Granted: 1973-03-27
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Expires: 1989-11-10
Abstract
Abstract This invention consists of an air cylinder that encompasses the upper portion of each valve stem and guide on an internal combustion engine. The air cylinders are provided with annular pistons. The upper end of each valve stem is provided with a dish-shaped washer that will rest on the top of a piston when the valve is open and will be forced upward by the top of the piston by the air in the cylinder to urge the valve toward its closed position.
Inventors
- 👤 H Overby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:43
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/46; F01L1/462; F01L1/465
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
Pneumatic valve-closing mechanism arranged for operative association with a standard engine valve, its valve stem, guide, and washer which comprises an air cylinder encompassing the valve stem and guide and forming an annular chamber in concentric relation therewith, an annular piston mounted for movement in the annular chamber of said air cylinder, and a source of air pressure in communication with said air cylinder to urge said piston against said washer thus to urge the valve toward its closed position.
Claim 2
Dependent Claim
80 words
Pneumatic valve-closing mechanism arranged for operative association with a standard engine valve, its valve stem, guide, and washer which comprises an air cylinder encompassing the valve stem and guide and forming an annular chamber in concentric relation therewith, an annular piston mounted for movement in the annular chamber of said air cylinder, and a source of air pressure in communication with said air cylinder to urge said piston against said washer thus to urge the valve toward its closed position.
Claim 3
Dependent Claim
19 words
Pneumatic valve-closing mechanism according to claim 1 wherein said piston constitutes the only element operative to effect valve closure.
Claim 4
Dependent Claim
42 words
Pneumatic valve-closing mechanism according to claim 1 which comprises a plurality of said cylinders and pistons, each associated with one of the plurality of valves of an engine, and means connecting said air pressure source in common to all of said cylinders.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |