US3577193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal cell
Assignee: Whittaker Corp
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Filing: 1968-03-22
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Granted: 1971-05-04
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Expires: 1988-03-22
Abstract
Abstract An improved device in the form of a web for detecting fires and other high temperature conditions comprises a conductive ring with a number of filamentary thermal cells mounted thereon, each cell including a core comprising stainless steel with a glass coating of specific composition disposed on the core and ionically conductive at a certain temperature. A sheath of metal, such as silver, dissimilar to the core metal is disposed on the glass coating. A lattice form of a spaced plurality of intersection cells connected at opposite ends to the ring and interwoven with one another at the intersections is provided.
Inventors
- 👤 Irving J Hutkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
203 words
A web for use in detecting fires of other high temperature conditions comprising: a conductive supporting ring, a plurality of filamentary thermal cells mounted on said supporting ring, each of said cells comprising an elongated core comprising an electrically conductive metal, stainless steel, a glass coating having the composition 30 percent Na20, 30 percent B203, 20 Si02 and 20 percent N203 disposed on said core, said glass coating being ionically conductive when heated to within a preselected temperature range and a sheath disposed on said glass coating, said sheath comprising an electrically conductive metal, silver, dissimilar to said core metal, a first group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, a second group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, the cells of said second group being displaced approximately 90* from the cells of said first group and interwoven therewith so that the sheaths of the cells of the first group engage and make good electrical contact with the sheaths of the cells of the second group at the points of intersection therewith.
Claim 2
Dependent Claim
203 words
A web for use in detecting fires of other high temperature conditions comprising: a conductive supporting ring, a plurality of filamentary thermal cells mounted on said supporting ring, each of said cells comprising an elongated core comprising an electrically conductive metal, stainless steel, a glass coating having the composition 30 percent Na20, 30 percent B203, 20 Si02 and 20 percent N203 disposed on said core, said glass coating being ionically conductive when heated to within a preselected temperature range and a sheath disposed on said glass coating, said sheath comprising an electrically conductive metal, silver, dissimilar to said core metal, a first group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, a second group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, the cells of said second group being displaced approximately 90* from the cells of said first group and interwoven therewith so that the sheaths of the cells of the first group engage and make good electrical contact with the sheaths of the cells of the second group at the points of intersection therewith.
Claim 3
Dependent Claim
201 words
A web for use in detecting fires or other high temperature conditions comprising: a conductive supporting ring, a plurality of filamentary thermal cells mounted on said supporting ring, each of said cells comprising an elongated core comprising an electrically conductive metal, stainless steel, a glass coating having the composition 30 percent Na2O, 30 percent B203 and 40 percent Si02 disposed on said core, said glass coating being ionically conductive when heated to within a preselected temperature range and a sheath disposed on said glass coating, said sheath comprising an electrically conductive metal, silver, dissimilar to said core metal, a first group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, a second group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, the cells of said second group being displaced approximateLy 90* from the cells of said first group and interwoven therewith so that the sheaths of the cells of the first group engage and make good electrical contact with the sheaths of the cells of the second group at the points of intersection therewith.
Claim 4
Dependent Claim
201 words
A web for use in detecting fires or other high temperature conditions comprising: a conductive supporting ring, a plurality of filamentary thermal cells mounted on said supporting ring, each of said cells comprising an elongated core comprising an electrically conductive metal, stainless steel, a glass coating having the composition 30 percent Na2O, 30 percent B203 and 40 percent Si02 disposed on said core, said glass coating being ionically conductive when heated to within a preselected temperature range and a sheath disposed on said glass coating, said sheath comprising an electrically conductive metal, silver, dissimilar to said core metal, a first group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, a second group of said cells being arranged in parallel within said ring and having each end of the cores thereof fastened to said ring, the cells of said second group being displaced approximateLy 90* from the cells of said first group and interwoven therewith so that the sheaths of the cells of the first group engage and make good electrical contact with the sheaths of the cells of the second group at the points of intersection therewith.
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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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |