US2953484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt-chromium electrical resistance device
Assignee: Allen Bradley Co LLC
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Filing: 1957-07-22
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Granted: 1960-09-20
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Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Bernhard F Tellkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:36
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/18; C22; C22C; C22C19/00; C22C19/07; C22C27/00; C22C27/06; H; H01; H01C; H01C7/00; H01C7/006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
THE METHOD OF FORMING AN ELECTRICAL RESISTANCE FILM WHICH CONSISTS IN HEATING A MIXTURE OF FROM 40 TO 80 PERCENT BY WEIGHT OF METALLIC CHROMIUM AND THE BALANCE SUBSTANTIALLY, ENTIRELY METALLIC COBALT IN A VESSEL IN AN EVACUATED ENCLOSURE WHEREIN THE PRESSURE IS LESS THAB 1X10**-4 MM OF MERCURY, TO A TEMPERATURE SUFFICIENT TO MELT AND VAPORIZE SAID METALS SIMULTANEOUSLY AT SIMILAR RATES OF VAPORIZATION, WHILE EXPOSING A COOLER NON-CON-
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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |