US2856368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance material for fire detector element
Assignee: Specialties Development Corp
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Filing: 1954-10-26
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Granted: 1958-10-14
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Expires: 1974-10-26
Abstract
No abstract record available.
Inventors
- 👤 Macintyre Ronald
- 👤 Leonard J Sheakley
- 👤 Jr John C Zenobia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:59
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A RESISTANCE MATERIAL CONSISTING ESSENTIALLY OF ABOUT 40 PARTS BY WEIGHT OF A MIXTURE CONSISTING OF BETWEEN 20 AND 32 PARTS BY WEIGHT OF MANGANESE DIOXIDE AND BETWEEN 20 AND 8 PARTS BY WEIGHT OF MAGNETIC IRON OXIDE, ABOUT 10 PARTS BY WEIGHT OF NEPHELINE SYENITE, ABOUT 4 PARTS BY WEIGHT OF ZIRCONIUM SILICATE, ABOUT 12.5 PARTS BY WEIGHT OF A FRIT AND ABOUT 33.75 PARTS BY WEIGHT OF STEATITE, SAID MATERIAL BEING CHARACTERISED IN THAT IT EXHIBITS A SHARP DROP IN RESISTANCE AT TEMPERATURES BETWEEN 370*F. AND 470*F.
Claim 2
Dependent Claim
89 words
A RESISTANCE MATERIAL CONSISTING ESSENTIALLY OF ABOUT 40 PARTS BY WEIGHT OF A MIXTURE CONSISTING OF BETWEEN 20 AND 32 PARTS BY WEIGHT OF MANGANESE DIOXIDE AND BETWEEN 20 AND 8 PARTS BY WEIGHT OF MAGNETIC IRON OXIDE, ABOUT 10 PARTS BY WEIGHT OF NEPHELINE SYENITE, ABOUT 4 PARTS BY WEIGHT OF ZIRCONIUM SILICATE, ABOUT 12.5 PARTS BY WEIGHT OF A FRIT AND ABOUT 33.75 PARTS BY WEIGHT OF STEATITE, SAID MATERIAL BEING CHARACTERISED IN THAT IT EXHIBITS A SHARP DROP IN RESISTANCE AT TEMPERATURES BETWEEN 370*F. AND 470*F.
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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |