US3105288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making deposited carbon resistors
Assignee: AT&T Inc
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Filing: 1959-02-27
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Granted: 1963-10-01
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Expires: 1979-02-27
Abstract
No abstract record available.
Inventors
- 👤 Donald E Johnson
- 👤 James L Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:39
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/245; H01B; H01B1/00; H01B1/20; H01B1/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49764; Y10T29/49771; Y10T409/00; Y10T409/30; Y10T409/300056; Y10T409/300672
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
AN APPARATUS FOR DETECTING IRREGULARITIES ON DEPOSITED CARBON RESISTORS COMPRISING MEANS FOR GRIPPING AND FOR ROTATING THE RESISTOR AT A UNIFORM RATE, MEANS FOR PROGRESSIVELY CUTTING A HELICAL GROOVE OF CONSTANT PITCH THROUGH THE CARBON FILM AS THE RESISTOR IS ROTATED TO FORM A PATH OF PREDETERMINED RESISTANCE VALUE AT A CONSTANT RATE, A DIFFERENTIATING NETWORK ELECTRICALLY CONNECTED ACROSS THE RESISTOR FOR SIMULTANEOUSLY SENSING THE TIMERATE CHANGE OF RESISTANCE OF THE RESISTANCE PATH AS IT IS PROGRESSIVELY FORMED, AND MEANS RESPONSIVE TO SAID CHANGE FOR REJECTING A RESISTOR HAVING A NON-UNIFORM FILM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |