US3835875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety check valves for gas lines
Assignee: Olson Manufacturing Co
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Filing: 1973-04-20
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Granted: 1974-09-17
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Expires: 1993-04-20
Abstract
Abstract This device is an improvement on prior types of heat-actuated safety check valves for gas supply lines which hold the valve member from closing by use of fusible metal restraining means linking the valve member to its housing. Here the fusible metal is formed as a solid body retained in a hollow plug screwed through the valve housing, with an open-coil spring imbedded in the fusible metal and forming a flexible linkage between the fusible metal and the valve member holding the valve open.
Inventors
- 👤 L Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:04
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; F16K17/386; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
Safety check valve hAving in combination a valve body, flowarresting means therein, and heat-responsive devices to prevent such means from arresting the flow including a hollow plug fixed in the valve body, a solid body of low-temperature-fusible metal fixed to the interior wall of the hollow plug, and flexible means linked to the flow-arresting means and including an open-wound coil spring having a plurality of its coils imbedded in the body of fusible metal, holding the flow-arresting means in a valve open position.
Claim 2
Dependent Claim
83 words
Safety check valve hAving in combination a valve body, flowarresting means therein, and heat-responsive devices to prevent such means from arresting the flow including a hollow plug fixed in the valve body, a solid body of low-temperature-fusible metal fixed to the interior wall of the hollow plug, and flexible means linked to the flow-arresting means and including an open-wound coil spring having a plurality of its coils imbedded in the body of fusible metal, holding the flow-arresting means in a valve open position.
References Cited (Backward Citations)
US2012873A
Cited
US3473544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |