US4485279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard switch
Assignee: Alps Alpine Co Ltd
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Filing: 1982-09-30
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Granted: 1984-11-27
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Expires: 2002-09-30
Abstract
Abstract A keyboard switch includes upper and lower substrates spaced from each other by a spacer having a plurality of spaces in which upper and lower contacts respectively on the upper and lower substrates are placed, respectively. An insulating sheet is sandwiched between the lower substrate and a base plate and has a plurality of slits aligned respectively in vent holes in the base plate and the lower substrate for preventing substantial passage therethrough of dirt or dust while allowing air to flow therethrough.
Inventors
- 👤 Moritoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H2213/00; H01H2213/002; H01H2213/008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
156 words
A keyboard switch comprising: (a) a base plate having a plurality of first vent holes; (b) an insulating sheet mounted on said base plate and a plurality of slits located respectively in alignment with said first vent holes for preventing substantial passage therethrough of dirt or dust while permitting air to flow therethrough; (c) a first substrate mounted on said insulating sheet and having a plurality of second vent holes respectively in alignment with said first vent holes and said slits, said first substrate supporting a plurality of first contacts; (d) an insulating spacer mounted on said first substrate and having a plurality of spaces in which said first contacts are positioned, respectively, said first vent holes, said slits and said second vent holes communicating with said spaces; and (e) a second substrate mounted on said insulating spacer and having a plurality of second contacts placed in said spaces respectively in alignment with said first contacts.
Claim 2
Dependent Claim
156 words
A keyboard switch comprising: (a) a base plate having a plurality of first vent holes; (b) an insulating sheet mounted on said base plate and a plurality of slits located respectively in alignment with said first vent holes for preventing substantial passage therethrough of dirt or dust while permitting air to flow therethrough; (c) a first substrate mounted on said insulating sheet and having a plurality of second vent holes respectively in alignment with said first vent holes and said slits, said first substrate supporting a plurality of first contacts; (d) an insulating spacer mounted on said first substrate and having a plurality of spaces in which said first contacts are positioned, respectively, said first vent holes, said slits and said second vent holes communicating with said spaces; and (e) a second substrate mounted on said insulating spacer and having a plurality of second contacts placed in said spaces respectively in alignment with said first contacts.
Claim 3
Dependent Claim
26 words
A keyboard switch according to claim 1, wherein said first contacts have recessed edges, said second vent holes being located adjacent to said recessed edges, respectively.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |