US4419653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable resistance switch
Assignee: BSH Hausgeräte GmbH
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Filing: 1981-10-14
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Granted: 1983-12-06
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Expires: 2001-10-14
Abstract
Abstract Variable resistance switch of a continuously-variable resistance pressure-dependent measurement sensor for triggering a switching operation of an electrical evaluating circuit through a compressive loading, including an elastic layer being formed of elastomeric material interspersed with electrically conductive particles and being deformable with increasing application of force, and a conductive surface disposed opposite the elastic layer.
Inventors
- 👤 Helmut Waigand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:00
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/10; H01C10/106; G; G01; G01L; G01L1/00; G01L1/20; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/029
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
Variable resistance switch of a continuously-variable resistance pressure-dependent measurement sensor for triggering a switching operation of an electrical evaluating circuit through a compressive loading, comprising an elastic layer formed of elastomeric material interspersed with electrically conductive particles and being deformable with increasing application of force, said elastic layer being pan-shaped and having a lower substantially planar surface, and a conductive surface being in contact with said lower substantially planar surface of said elastic layer.
Claim 2
Dependent Claim
74 words
Variable resistance switch of a continuously-variable resistance pressure-dependent measurement sensor for triggering a switching operation of an electrical evaluating circuit through a compressive loading, comprising an elastic layer formed of elastomeric material interspersed with electrically conductive particles and being deformable with increasing application of force, said elastic layer being pan-shaped and having a lower substantially planar surface, and a conductive surface being in contact with said lower substantially planar surface of said elastic layer.
Claim 3
Dependent Claim
36 words
Variable resistance switch according to claim 1, wherein said elastic layer has an area thereof exposed to the compressive loading, and including another layer of pure elastomeric material superimposed on said area of said elastic layer.
Claim 4
Dependent Claim
22 words
Variable resistance switch according to claim 1 or 2, including a contact having two surfaces and being disposed opposite said elastic layer.
Claim 5
Dependent Claim
41 words
Variable resistance switch according to claim 2, including a contact having two surfaces and being disposed opposite said elastic layer, and a planar base plate being formed of electrically insulating material and being vulcanized together with said pure elastomeric material layer.
Claim 6
Dependent Claim
74 words
Variable resistance switch of a continuously-variable resistance pressure-dependent measurement sensor for triggering a switching operation of an electrical evaluating circuit through a compressive loading, comprising two elastic layers each being formed of elastomeric material interspersed with electricall conductive particles and being deformable with increasing application of force, each of said elastic layers having a respective mutually opposite surface with interlocking saw tooth-shaped ridges formed thereon, and terminal contacts rigidly connected on said elastic layers.
Claim 7
Dependent Claim
74 words
Variable resistance switch of a continuously-variable resistance pressure-dependent measurement sensor for triggering a switching operation of an electrical evaluating circuit through a compressive loading, comprising two elastic layers each being formed of elastomeric material interspersed with electricall conductive particles and being deformable with increasing application of force, each of said elastic layers having a respective mutually opposite surface with interlocking saw tooth-shaped ridges formed thereon, and terminal contacts rigidly connected on said elastic layers.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |