Patent US4072159A successfully refreshed from Google Patents.
US4072159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency valve incorporating thermal foamable plastic material
Assignee: Individual
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Filing: 1975-12-19
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Granted: 1978-02-07
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Expires: 1995-12-19
Abstract
Abstract This emergency valve comprises a thermal foamable plastics element or a valve operation gear with a built-in thermal foamable plastics element, which is functioned by thermal foaming and expansion of the built-in thermal foamable plastics, and if a fire broken out near the valve, the valve should be automatically and non-reversibly closed or opened by the valve operation gear which is functioned by thermal foamed plastics or thermal foamed plastics in itself.
Inventors
- 👤 Toyoki Kurosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:52
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/04; F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; F16K31/00; F16K31/001; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1842; Y10T137/1939; Y10T137/1963
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
An emergency shut-off valve for irreversibly stopping the flow of material in a conduit when an excessive temperature external to the valve is sensed by the valve, said valve comprising a valve casing defining a chamber which communicates with said conduit, and a thermally foamable heat-resistant plastic element residing in said chamber in an amount sufficient to irreversibly expand into said conduit and shut off the flow of material therein, said element in unexpanded condition allowing the flow of material through said conduit; and wherein said thermally foamable heat-resistant plastic element located in said chamber is packed in a stretchable membrane which comprises a shell-like expandable can of a material that will spring into an inflated condition closing off flow upon expansion of said plastic element.
Claim 2
Dependent Claim
126 words
An emergency shut-off valve for irreversibly stopping the flow of material in a conduit when an excessive temperature external to the valve is sensed by the valve, said valve comprising a valve casing defining a chamber which communicates with said conduit, and a thermally foamable heat-resistant plastic element residing in said chamber in an amount sufficient to irreversibly expand into said conduit and shut off the flow of material therein, said element in unexpanded condition allowing the flow of material through said conduit; and wherein said thermally foamable heat-resistant plastic element located in said chamber is packed in a stretchable membrane which comprises a shell-like expandable can of a material that will spring into an inflated condition closing off flow upon expansion of said plastic element.
Claim 3
Dependent Claim
39 words
An emergency shut-off valve according to claim 1, wherein said plastic element is fully encased in said membrane and said membrane comprises an expandable container capable of protecting the plastic element from deterioration and the valve from plastic contamination.
Claim 4
Dependent Claim
38 words
An emergency shut-off valve according to claim 1 which further includes a means for sensing excessive temperature at a spaced distance from said valve and in response thereto causing said plastic element to irreversibly expand into said conduit.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |