Patent US3652929A successfully refreshed from Google Patents.
US3652929A
Expired / Lapsed
US
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Method for healing short circuits in capacitors
Assignee: AT&T Inc
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Filing: 1970-02-09
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Granted: 1972-03-28
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Expires: 1990-02-09
Abstract
Abstract Resistance of self-healing capacitors is measured to detect short circuits of lowest resistance. Electrical charge of relatively high current for relatively short time is applied to burn out lowest resistance short circuits. Resistance is again measured to detect short circuits of higher resistance. Electrical charge of relatively lower current for relatively longer time is applied to burn out higher resistance short circuits. Resistance is again measured to detect short circuits of still higher resistance. Electrical charge of relatively still lower current for relatively still longer time is applied to burn out still higher resistance short circuits.
Inventors
- 👤 Robert Holbrook Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:02
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R31/00; G01R31/50; G01R31/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
Method of clearing a self-healing capacitor, said method comprising: a. making a resistance measurement across said self-healing capacitor to detect a short circuit across said capacitor and the electrical resistance of said short circuit; b. applying an electrical charge across the capacitor, the current and duration of said electrical charge being proportionate to the electrical resistance of said short circuit, whereby to deliver sufficient electrical energy, and not substantially in excess thereof, to burn out said short circuit; c. subsequent to step (b), making a second resistance measurement across said self-healing capacitor to detect a second short circuit across said capacitor and the electrical resistance of said second short circuit, said second short circuit having a higher electrical resistance than said firstmentioned short circuit; d. applying a second electrical charge across the capacitor, the current and duration of said second electrical charge being proportionate to the electrical resistance of said second short circuit, whereby to deliver sufficient electrical energy, and not substantially in excess thereof, to burn out said second short circuit.
Claim 2
Dependent Claim
172 words
Method of clearing a self-healing capacitor, said method comprising: a. making a resistance measurement across said self-healing capacitor to detect a short circuit across said capacitor and the electrical resistance of said short circuit; b. applying an electrical charge across the capacitor, the current and duration of said electrical charge being proportionate to the electrical resistance of said short circuit, whereby to deliver sufficient electrical energy, and not substantially in excess thereof, to burn out said short circuit; c. subsequent to step (b), making a second resistance measurement across said self-healing capacitor to detect a second short circuit across said capacitor and the electrical resistance of said second short circuit, said second short circuit having a higher electrical resistance than said firstmentioned short circuit; d. applying a second electrical charge across the capacitor, the current and duration of said second electrical charge being proportionate to the electrical resistance of said second short circuit, whereby to deliver sufficient electrical energy, and not substantially in excess thereof, to burn out said second short circuit.
Claim 3
Dependent Claim
20 words
Method as in claim 1, wherein: e. said second electrical charge has a lower current than said first-mentioned electrical charge.
Claim 4
Dependent Claim
20 words
Method as in claim 1, wherein: e. said second electrical charge has a longer duration than said first-mentioned electrical charge.
Claim 5
Dependent Claim
34 words
Method as in claim 1, wherein: e. said second electrical charge has a lower current than said first-mentioned electrical charge, f. said second electrical charge has a longer duration than said first-mentioneD electrical charge.
References Cited (Backward Citations)
US2769889A
Cited
US2911590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |