US2778743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electrical carbonfilm resistors
Assignee: AT&T Inc
•
Filing: 1954-11-16
•
Granted: 1957-01-22
•
Expires: 1974-11-16
Abstract
No abstract record available.
Inventors
- 👤 Brice M Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/20; Y; Y10; Y10S; Y10S264/00; Y10S264/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF MAKING BOROCARBON-FILM ELECTRICAL RESISTORS WITH INCREASED STABILITY AGAINST HEAT, MOISTURE, AND ABRASION DUE TO INCREASED ADHERENCE AND COHERENCE OF THE FILM, WHICH METHOD COMPRISES CONTACTING AT AN ELEVATED TEMPERATURE A NON-CONDUCTING CORE WITH A GASEOUS MIXTURE COMPRISING CHEMICALLY-BOUND CARBON, CHEMICALLY-BOUND BORON, AND CHEMICALLY-BOUND SILICON, IN WHICH MIXTURE THE RATIO OF THE NUMBER OF BOUND BORON ATOMS TO THE NUMBER OF BOUND CARBON ATOMS LIES BETWEEN 1.00 AND 0.01 AND THE RATIO OF THE NUMBER OF BOUND SILICON ATOMS TO THE NUMBER OF BOUND CARBON ATOMS LIES BETWEEN 3.00 AND 0.01.
Claim 2
Independent Claim
93 words
THE METHOD OF MAKING BOROCARBON-FILM ELECTRICAL RESISTORS WITH INCREASED STABILITY AGAINST HEAT, MOISTURE, AND ABRASION DUE TO INCREASED ADHERENCE AND COHERENCE OF THE FILM, WHICH METHOD COMPRISES CONTACTING AT AN ELEVATED TEMPERATURE A NON-CONDUCTING CORE WITH A GASEOUS MIXTURE COMPRISING CHEMICALLY-BOUND CARBON, CHEMICALLY-BOUND BORON, AND CHEMICALLY-BOUND SILICON, IN WHICH MIXTURE THE RATIO OF THE NUMBER OF BOUND BORON ATOMS TO THE NUMBER OF BOUND CARBON ATOMS LIES BETWEEN 1.00 AND 0.01 AND THE RATIO OF THE NUMBER OF BOUND SILICON ATOMS TO THE NUMBER OF BOUND CARBON ATOMS LIES BETWEEN 3.00 AND 0.01.
References Cited (Backward Citations)
US1742259A
Cited
US2057431A
Cited
US2313410A
Cited
US2328422A
Cited
US2544320A
Cited
US2671735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |