Patent US2715889A successfully refreshed from Google Patents.
US3597579A
Expired / Lapsed
US
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Method of trimming capacitors
Assignee: AT&T Inc
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Filing: 1970-06-25
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Granted: 1971-08-03
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Expires: 1990-06-25
Abstract
Abstract A method of trimming a capacitor wherein radiant energy is applied to an electrode to adjust the electrode area while an electrical potential is applied across the electrodes of the capacitor to inhibit the formation of electrical shorts.
Inventors
- 👤 Robert Miller Lumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:22
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/255; B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/073; B23K26/0738; B23K26/351
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
In an improved method of trimming a capacitor wherein radiant energy is applied to an electrode of said capacitor to selectively remove portions of said electrode and change the effective electrode area, the improvement comprising: applying a voltage across said capacitor while said radiant energy is applied to said electrode said voltage being of such magnitude as to inhibit the formation of shorts during the application of said radiant energy but of insufficient magnitude to deleteriously affect the plates and dielectric of said capacitor.
Claim 2
Dependent Claim
84 words
In an improved method of trimming a capacitor wherein radiant energy is applied to an electrode of said capacitor to selectively remove portions of said electrode and change the effective electrode area, the improvement comprising: applying a voltage across said capacitor while said radiant energy is applied to said electrode said voltage being of such magnitude as to inhibit the formation of shorts during the application of said radiant energy but of insufficient magnitude to deleteriously affect the plates and dielectric of said capacitor.
Claim 3
Independent Claim
80 words
A method of trimming a capacitor comprising: applying a laser beam to an electrode of the capacitor to selectively remove portions of said electrode and change the effective electrode area, and applying a voltage to said capacitor while said laser beam is applied to said electrode said voltage being of such magnitude as to inhibit the formation of shorts during the application of said laser beam but of insufficient magnitude to deleteriously affect the plates and dielectric of said capacitor.
Claim 4
Independent Claim
80 words
A method of trimming a capacitor comprising: applying a laser beam to an electrode of the capacitor to selectively remove portions of said electrode and change the effective electrode area, and applying a voltage to said capacitor while said laser beam is applied to said electrode said voltage being of such magnitude as to inhibit the formation of shorts during the application of said laser beam but of insufficient magnitude to deleteriously affect the plates and dielectric of said capacitor.
Claim 5
Dependent Claim
24 words
The method of claim 2 wherein the step of applying the laser beam to the electrode includes focusing the laser beam to a spot.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the focus of the laser beam is adjusted to control the diameter of the spot.
Claim 7
Dependent Claim
27 words
The method of claim 3 which includes the additional step of displacing the laser beam relative to the electrode to remove a controlled amount of said electrode.
Claim 8
Dependent Claim
21 words
The method of claim 5 wherein the laser beam is displaced across said electrode to electrically isolate a selected portion thereof.
Claim 9
Dependent Claim
24 words
The method of claim 2 wherein the step of applying the laser beam to the electrode includes focusing the laser beam to a line.
Claim 10
Dependent Claim
49 words
The method of claim 7 wherein the focus of the laser beam is adjusted to control the width of the line. 9 The difficult, of claim 7 which includes the additional step of displacing the laser beam relative to the electrode is remove a controlled amount of said electrode.
Claim 11
Dependent Claim
22 words
The method of claim 2 wherein the step of applying the laser beam includes focusing the laser beam to a perimeter-type pattern.
References Cited (Backward Citations)
US2769889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |