Patent US2639247A successfully refreshed from Google Patents.
US2639247A
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Method of making heat or flame detecting elements
Assignee: Specialties Development Corp
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Filing: 1949-11-17
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Granted: 1953-05-19
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Donald R Squier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:39
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/10; H01B7/102; G; G08; G08B; G08B17/00; G08B17/06; H01C; H01C7/00; H01C7/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF MAKING CONTINUOUS FLEXIBLE HEAT OR FLAME DETECTING ELEMENTS OF THE CLASS DESCRIBED, WHICH COMPRISES APPLYING A CONTINUOUS FLEXIBLE COVERING OF FIBER GLASS YARN TO AN ELECTRICALLY CONDUCTIVE FLEXIBLE WIRE, AND APPLYING A MATERIAL TO THE COVERING ADAPTED TO GIVE THE COVERING DESIRED HEAT DETECTING CHARACTERISTICS SAID MATERIAL BEING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM OXIDE, ALUMINUM SILICATE, CALCIUM OXIDE, CHROMIC OXIDE, CHROMITE, MAGNESIUM OXIDE, MAGNESIUM SILICATE, SILICON CARBIDE TITANIUM OXIDE, ZIRCONIUM OXIDE AND ZIRCONIUM CARBIDE.
Claim 2
Independent Claim
81 words
A METHOD OF MAKING CONTINUOUS FLEXIBLE HEAT OR FLAME DETECTING ELEMENTS OF THE CLASS DESCRIBED, WHICH COMPRISES APPLYING A CONTINUOUS FLEXIBLE COVERING OF FIBER GLASS YARN TO AN ELECTRICALLY CONDUCTIVE FLEXIBLE WIRE, AND APPLYING A MATERIAL TO THE COVERING ADAPTED TO GIVE THE COVERING DESIRED HEAT DETECTING CHARACTERISTICS SAID MATERIAL BEING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM OXIDE, ALUMINUM SILICATE, CALCIUM OXIDE, CHROMIC OXIDE, CHROMITE, MAGNESIUM OXIDE, MAGNESIUM SILICATE, SILICON CARBIDE TITANIUM OXIDE, ZIRCONIUM OXIDE AND ZIRCONIUM CARBIDE.
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) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |