US4264797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated key membrane switch
Assignee: BROCKSON INVESTMENT Co
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Filing: 1980-01-21
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Granted: 1981-04-28
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Expires: 2000-01-21
Abstract
Abstract A multi-layered membrane switch having a spacer layer with one or more tabs extending across the width of its cut out portion to provide support for an upper contact supporting layer.
Inventors
- 👤 Wayne K. Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:48
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H13/703; H01H2211/00; H01H2211/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A multi-layered flexible membrane switch comprising a lower contact supporting layer having a first electrical contact on its upper surface, an upper contact supporting layer located thereabove having a second electrical contact on its lower surface, and a spacer layer located between said upper and lower layers and having a cut out portion with a length to width ratio greater than one, said spacer layer having at least one tab partially extending from one of the longer sides of said portion into the width of said portion.
Claim 2
Dependent Claim
87 words
A multi-layered flexible membrane switch comprising a lower contact supporting layer having a first electrical contact on its upper surface, an upper contact supporting layer located thereabove having a second electrical contact on its lower surface, and a spacer layer located between said upper and lower layers and having a cut out portion with a length to width ratio greater than one, said spacer layer having at least one tab partially extending from one of the longer sides of said portion into the width of said portion.
Claim 3
Dependent Claim
16 words
The switch of claim 1 in which said length to width ratio is at least two.
Claim 4
Dependent Claim
16 words
The switch of claim 2 wherein each said tab extends less than half-way across said width.
Claim 5
Dependent Claim
25 words
The switch of claim 3 wherein said layer has more than one tab, said tabs being alternately located along opposite longer sides of said portion.
Claim 6
Dependent Claim
24 words
The switch of claim 4 wherein the centerline to centerline distances along said length between tabs are equal to or greater than said width.
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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |