Patent US3611246A successfully refreshed from Google Patents.
US3611246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium-carbon and chromium-nickel-carbon resistive films
Assignee: Individual
•
Filing: 1969-12-22
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Granted: 1971-10-05
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Expires: 1989-12-22
Abstract
Abstract A resistor which includes a film consisting essentially of 1-15 percent, by weight, carbon and the remainder a material selected from the group consisting essentially of chromium and nickelchromium.
Inventors
- 👤 James M Booe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:45
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
25 words
A resistor according to claim 1 wherein said metal is nickel-chromium in a ratio of about 80 weight percent nickel and 20 weight percent chromium.
Claim 2
Dependent Claim
29 words
A resistor according to claim 1 wherein said film consists essentially of about 5 weight percent to about 10 weight percent carbon, the remainder consisting essentially of said metal.
Claim 3
Dependent Claim
21 words
A resistor according to claim 1 wherein said film has a thickness of about a few angstroms to about 0.001 inch.
Claim 4
Dependent Claim
20 words
A resistor according to claim 1 wherein said substrate is selected from the group consisting of alumina, quartz and steatite.
Claim 5
Dependent Claim
16 words
A resistor according to claim 5 wherein said metal is chromium and said substrate is alumina.
Claim 6
Dependent Claim
12 words
A resistor according to claim 1 wherein said substrate is a tube.
Claim 7
Dependent Claim
44 words
A resistor according to claim 6 wherein said alumina substrate is a tube about 1 1/2 inches long by about one quarter inch in diameter and said chromium-carbon film has a resistivity of about 25 ohms to about 3,000 ohms in the unconfigured condition.
Claim 8
Dependent Claim
29 words
A resistor according to claim 8 wherein said film consists essentially of about 5 weight percent to about 10 weight percent carbon, the remainder consisting essentially of said chromium.
Claim 9
Dependent Claim
12 words
A resistor according to claim 7 wherein said film includes spiral grooves.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |