US2714054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating chromic oxide
Assignee: Houdry Process Corp
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Filing: 1952-02-15
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Granted: 1955-07-26
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Expires: 1972-02-15
Abstract
No abstract record available.
Inventors
- 👤 Sterling E Voltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:58
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; C; C01; C01G; C01G37/00; C01G37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A METHOD OF MAKING A TEMPERATURE RESPONSIVE RESISTANCE ELEMENT HAVING A NEGATIVE TEMPERATURE COEFFICIENT COMPRISING TREATING A MASS OF CHROMIC OXIDE WITH OXYGEN AT 350*C. UNTIL SUBSTANTIALLY ALL OF SAID CHROMIC OXIDE HAS THE ATOMIC RATIO OF TWO ATOMS OF
Claim 2
Independent Claim
40 words
A METHOD OF MAKING A TEMPERATURE RESPONSIVE RESISTANCE ELEMENT HAVING A NEGATIVE TEMPERATURE COEFFICIENT COMPRISING TREATING A MASS OF CHROMIC OXIDE WITH OXYGEN AT 350*C. UNTIL SUBSTANTIALLY ALL OF SAID CHROMIC OXIDE HAS THE ATOMIC RATIO OF TWO ATOMS OF
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) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |