US4231011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discontinuous metal film resistor and strain gauges
Assignee: University of Pittsburgh
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Filing: 1979-09-24
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Granted: 1980-10-28
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Expires: 1999-09-24
Abstract
Abstract An improved discontinuous film resistor and strain gauge is disclosed wherein the discontinuous metal film is maintained in a constant humidity in the range of 15% to 45% thereby substantially increasing the life of the strain gauge.
Inventors
- 👤 Robert M. DelVecchio
- 👤 Zvi H. Meiksin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:01
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2287; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49103
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
A strain gauge comprising: a. a substrate composed of nonconductive material, b. a discontinuous metal film on the substrate, c. a plurality of electrodes attached to the metal film, and d. means for maintaining an environment having a constant humidity in the range of 15% to 45% about the discontinuous metal film.
Claim 2
Dependent Claim
52 words
A strain gauge comprising: a. a substrate composed of nonconductive material, b. a discontinuous metal film on the substrate, c. a plurality of electrodes attached to the metal film, and d. means for maintaining an environment having a constant humidity in the range of 15% to 45% about the discontinuous metal film.
Claim 3
Dependent Claim
17 words
The strain gauge of claim 1 wherein the means for maintaining the constant humidity environment is encapsulation.
Claim 4
Dependent Claim
15 words
The strain gauge of claim 2 wherein the gauge is encapsulated by a flexible material.
Claim 5
Dependent Claim
11 words
The strain gauge of claim 1 wherein the humidity is 28%.
Claim 6
Dependent Claim
27 words
The strain gauge of claim 1 wherein the discontinuous metal film is composed of a metal selected from the group consisting of gold, platinum, chromium and copper.
Claim 7
Dependent Claim
12 words
The strain gauge of claim 1 wherein the substrate has been irradiated.
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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |