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Patent US4812800A successfully refreshed from Google Patents.
US4812800A
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Strain gage having a thin discontinuous metal layer
Assignee: BASF SE
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Filing: 1987-02-05
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Granted: 1989-03-14
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Expires: 2007-02-05
Abstract
Abstract A highly sensitive strain gage containing a thin discontinuous metal layer whose conduction effect is based predominantly on the tunnel effect and which is applied uniformly onto a thin, nonmetallic, dielectric or semiconducting substrate such as uniaxially oriented or partially crystalline plastic film, an ordered ultrathin layer or a silicone-coated plastic film, the diffusion processes in the applied metal layer being reduced and its structural stability improved as a result of interaction of the substrate with the metal layer.
Inventors
- 👤 Harald Fuchs
- 👤 Herbert Gleiter
- 👤 Stephan Trapp
- 👤 Juergen Petermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:03
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/16; G01B7/18; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2287; H; H01; H01C; H01C10/00; H01C10/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A tunnel strain gage possessing a thin discontinuous metal layer which changes its electrical resistance with strain, wherein the said strain gage (a) contains a thin discontinuous metal layer whose conduction effect is based predominantly on the tunnel effect and which is (b) applied uniformly to a thin, nonmetallic, dielectric or semiconducting substrate, the diffusion processes in the applied metal layer being reduced by interaction between the substrate and the metal layer.
Claim 2
Dependent Claim
72 words
A tunnel strain gage possessing a thin discontinuous metal layer which changes its electrical resistance with strain, wherein the said strain gage (a) contains a thin discontinuous metal layer whose conduction effect is based predominantly on the tunnel effect and which is (b) applied uniformly to a thin, nonmetallic, dielectric or semiconducting substrate, the diffusion processes in the applied metal layer being reduced by interaction between the substrate and the metal layer.
Claim 3
Dependent Claim
21 words
A strain gage as claimed in claim 1, which has a thin covering layer on top of the discontinuous metal layer.
Claim 4
Dependent Claim
16 words
A strain gage as claimed in claim 1, wherein the substrate is a silicone-coated plastic film.
Claim 5
Dependent Claim
17 words
A strain gage as claimed in claim 1, wherein the substrate is a uniaxially oriented plastic film.
Claim 6
Dependent Claim
23 words
A strain gage as claimed in claim 1, wherein the substrate is an ordered ultrathin layer which is less than 0.1 μm thick.
Claim 7
Dependent Claim
30 words
A strain gage as claimed in claim 1, wherein the substrate is a silicone-coated plastic film, and a thin covering layer is present on top of the discontinuous metal layer.
Claim 8
Dependent Claim
31 words
A strain gage as claimed in claim 1, wherein the substrate is a uniaxially oriented plastic film, and a thin covering layer is present on top of the discontinuous metal layer.
Claim 9
Dependent Claim
17 words
A strain gage as claimed in claim 1, wherein the substrate is a polymer containing crystalline components.
Claim 10
Dependent Claim
18 words
A strain gage as claimed in claim 1, wherein the metal of the discontinuous metal layer is gold.
Claim 11
Dependent Claim
29 words
A strain gage as claimed in claim 1, wherein the metal of the metal layer is selected from the group consisting of tin, zinc, indium, cadmium, antimony and selenium.
References Cited (Backward Citations)
US2556132A
Cited
US2621276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |