US2740030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal sulfide resistance elements
Assignee: General Electric Co
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Filing: 1952-07-12
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Granted: 1956-03-27
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Expires: 1972-07-12
Abstract
No abstract record available.
Inventors
- 👤 Frederic R Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:51
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01B; H01B1/00; H01B1/06; H01B1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A STABLE ELECTRIC RESISTANCE ELEMENT COMPRISING A BODY OF RESISTANCE MATERIAL COMPRISING A COMPRESSED, SINTERED MIXTURE OF A PLURALITY OF METAL SULFIDES INCLUDING, BY WEIGHT FROM 2 TO 20 PERCENT MOLYBDENUM SULFIDE, 2 TO 20 PERCENT ZINC SULFIDE, 2 TO 15 PERCENT OF AT LEAST ONE SULFIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM SULFIDE AND CALCIUM SULFIDE, AND FROM 60 TO 80 PERCENT OF AN ADDITIONAL METAL SULFIDE EXHIBITING A DEFINITE BREAK IN ITS TEMPERATURE RESISTANCE CURVE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, COPPER, PLATINUM MERCURY, LEAD, ANTIMONY, ALUMINUM, CHROMIUM, NICKEL ADND GROUP 2 METAL SULFIDES OTHER THAN ZINC, BARIUM OR CALCIUM SULFIDES, AND METAL LEAD ELECTRICALLY CONNECTED TO SAID RESISTANCE MATERIAL.
Claim 2
Dependent Claim
115 words
A STABLE ELECTRIC RESISTANCE ELEMENT COMPRISING A BODY OF RESISTANCE MATERIAL COMPRISING A COMPRESSED, SINTERED MIXTURE OF A PLURALITY OF METAL SULFIDES INCLUDING, BY WEIGHT FROM 2 TO 20 PERCENT MOLYBDENUM SULFIDE, 2 TO 20 PERCENT ZINC SULFIDE, 2 TO 15 PERCENT OF AT LEAST ONE SULFIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM SULFIDE AND CALCIUM SULFIDE, AND FROM 60 TO 80 PERCENT OF AN ADDITIONAL METAL SULFIDE EXHIBITING A DEFINITE BREAK IN ITS TEMPERATURE RESISTANCE CURVE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, COPPER, PLATINUM MERCURY, LEAD, ANTIMONY, ALUMINUM, CHROMIUM, NICKEL ADND GROUP 2 METAL SULFIDES OTHER THAN ZINC, BARIUM OR CALCIUM SULFIDES, AND METAL LEAD ELECTRICALLY CONNECTED TO SAID RESISTANCE MATERIAL.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |