Patent US3944043A successfully refreshed from Google Patents.
US2785142A
Expired / Lapsed
US
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Core composition for fire detector element
Assignee: Specialties Development Corp
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Filing: 1955-09-19
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Granted: 1957-03-12
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Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Macintyre Ronald
- 👤 Raymond E Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:34
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A CORE COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 25% TO ABOUT 40% BY WEIGHT OF MANGANESE DIOXIDE, ABOUT 25% TO 40% BY WEIGHT OF ALUMINUM OXIDE, ABOUT 15% TO ABOUT 40% BY WEIGHT OF TALC, AND ABOUT 5% TO ABOUT 8% BY WEIGHT OKF LEAD BORATE.
Claim 2
Dependent Claim
45 words
A CORE COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 25% TO ABOUT 40% BY WEIGHT OF MANGANESE DIOXIDE, ABOUT 25% TO 40% BY WEIGHT OF ALUMINUM OXIDE, ABOUT 15% TO ABOUT 40% BY WEIGHT OF TALC, AND ABOUT 5% TO ABOUT 8% BY WEIGHT OKF LEAD BORATE.
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) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |