US2507233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance and method of making
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-05-09
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Granted: 1950-05-09
•
Expires: 1966-05-09
Abstract
No abstract record available.
Inventors
- 👤 Verwey Evert Johannes Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A LOW TEMPERTURE COEFFICIENT ELECTRICAL RESISTANCE ELEMENT CONSISTING ESSENTIALLY OF A TWOPHASE CRYSTALLINE STRUCTURE CONSTITUTED BY MAGNESIUM OXIDE, AND CONDUCCTIE PARTICLES OF A TITANIUM OXIDE CORRESPONDING TO THE FORMULA TIO IN WHICH X HAS A VALUE BETWEEN 1.65 AND 1.7 IN AN AMOUNT UP TO APPROXIMATELY 3% BY WEIGHT OF SAID MAGNESIUM OXIDE DISPERSED IN THE LATTER.
Claim 2
Dependent Claim
57 words
A LOW TEMPERTURE COEFFICIENT ELECTRICAL RESISTANCE ELEMENT CONSISTING ESSENTIALLY OF A TWOPHASE CRYSTALLINE STRUCTURE CONSTITUTED BY MAGNESIUM OXIDE, AND CONDUCCTIE PARTICLES OF A TITANIUM OXIDE CORRESPONDING TO THE FORMULA TIO IN WHICH X HAS A VALUE BETWEEN 1.65 AND 1.7 IN AN AMOUNT UP TO APPROXIMATELY 3% BY WEIGHT OF SAID MAGNESIUM OXIDE DISPERSED IN THE LATTER.
References Cited (Backward Citations)
US2272480A
Cited
GB189916140A
Cited
DE486856C
Cited
GB438706A
Cited
GB467113A
Cited
GB498904A
Cited
US2175916A
Cited
US2289211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |