Patent US3827142A successfully refreshed from Google Patents.
US3827142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning of encapsulated precision resistor
Assignee: GTI Corp
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Filing: 1972-12-11
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Granted: 1974-08-06
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Expires: 1992-12-11
Abstract
Abstract A long wave laser beam is controllably passed through a glassy envelope encapsulating an electrical resistor, to alter its resistance to a precision value.
Inventors
- 👤 K Bennett
- 👤 J Crownover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:08
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/12; B23K26/123; B23K26/127; H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/242; H01C17/28; H01C17/281; H01C17/283; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49099; Y10T29/49101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
The method of making an encapsulated precision resistor, that includes a. encapsulating a resistance element within a glassy envelope, the element consisting of a metallic film on a substrate and having terminals within the envelope in the form of a glass sleeve to which electrode plugs are fitted at opposite ends of the element, said encapsulating step including confining noble metal oxide particles between the plugs and the element terminals and in a reducing gas environment, transferring heat to the particles from the exterior of the sleeve and plugs to cause blister formation characterized by particle decomposition with oxygen release and formation of active noble metal surfaces urged into intimate contact with the chip terminals, and fusing the sleeve to the plugs to hermetically seal the element in the sleeve, and b. directing a laser beam through the envelope to impinge on said element and thereby effect a change in the electrical resistance of said element to a desired value.
Claim 2
Independent Claim
160 words
The method of making an encapsulated precision resistor, that includes a. encapsulating a resistance element within a glassy envelope, the element consisting of a metallic film on a substrate and having terminals within the envelope in the form of a glass sleeve to which electrode plugs are fitted at opposite ends of the element, said encapsulating step including confining noble metal oxide particles between the plugs and the element terminals and in a reducing gas environment, transferring heat to the particles from the exterior of the sleeve and plugs to cause blister formation characterized by particle decomposition with oxygen release and formation of active noble metal surfaces urged into intimate contact with the chip terminals, and fusing the sleeve to the plugs to hermetically seal the element in the sleeve, and b. directing a laser beam through the envelope to impinge on said element and thereby effect a change in the electrical resistance of said element to a desired value.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said laser beam exhibits a wave length of at least about one thousandth of a millimeter.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said change increases the resistance of said element.
Claim 5
Dependent Claim
24 words
The method of claim 1 including effecting relative movement of the beam and element to effect beam impingement on different portions of the element.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein the impingement of the beam on the element is continued for a time interval between 0.5 and 60 seconds.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |