US3879602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard
Assignee: N Dimensions Inc
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Filing: 1973-06-11
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Granted: 1975-04-22
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Expires: 1993-06-11
Abstract
Abstract A keyboard including a plurality of keys, each arranged to engage and move a member, both resiliently and magnetically restrained, from a non-operative to an operative position to introduce input data into an electronic unit such as a printer, calculator, computer or the like.
Inventors
- 👤 Alexander D R Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; B; B41; B41J; B41J5/00; B41J5/08; G; G06; G06C; G06C7/00; G06C7/02; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H1/26; H01H13/50; H01H5/00; H01H5/02; H01H2215/00; H01H2215/028; H01H2215/034; H01H2215/042
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
In a keyboard, the combination comprising: a. a plate member, b. a plurality of apertures in saiD plate member, c. a plurality of elongated spring members, d. one of said spring members lying under each of said apertures, e. a first end of each of said spring members being fastened to said plate, f. the second end of each of said spring members and said plate having mutually attracting magnetic means thereon whereby said second end is attracted to and held against said plate, g. the resilience of said spring member biasing said second end toward said plate, h. first contact means on said second end of each of said spring members, i. second contact means located in operative relationship with said first contact means, j. key means in each of said apertures, said key means being adapted to put pressure on said spring means between the ends thereof whereby initial pressure on said key means will flex said spring member and additional pressure will break away said magnetic means and cause said contacts to change their operative relationship.
Claim 2
Dependent Claim
179 words
In a keyboard, the combination comprising: a. a plate member, b. a plurality of apertures in saiD plate member, c. a plurality of elongated spring members, d. one of said spring members lying under each of said apertures, e. a first end of each of said spring members being fastened to said plate, f. the second end of each of said spring members and said plate having mutually attracting magnetic means thereon whereby said second end is attracted to and held against said plate, g. the resilience of said spring member biasing said second end toward said plate, h. first contact means on said second end of each of said spring members, i. second contact means located in operative relationship with said first contact means, j. key means in each of said apertures, said key means being adapted to put pressure on said spring means between the ends thereof whereby initial pressure on said key means will flex said spring member and additional pressure will break away said magnetic means and cause said contacts to change their operative relationship.
Claim 3
Dependent Claim
179 words
In a keyboard, the combination comprising: a. a plate member, b. a plurality of apertures in saiD plate member, c. a plurality of elongated spring members, d. one of said spring members lying under each of said apertures, e. a first end of each of said spring members being fastened to said plate, f. the second end of each of said spring members and said plate having mutually attracting magnetic means thereon whereby said second end is attracted to and held against said plate, g. the resilience of said spring member biasing said second end toward said plate, h. first contact means on said second end of each of said spring members, i. second contact means located in operative relationship with said first contact means, j. key means in each of said apertures, said key means being adapted to put pressure on said spring means between the ends thereof whereby initial pressure on said key means will flex said spring member and additional pressure will break away said magnetic means and cause said contacts to change their operative relationship.
Claim 4
Dependent Claim
179 words
In a keyboard, the combination comprising: a. a plate member, b. a plurality of apertures in saiD plate member, c. a plurality of elongated spring members, d. one of said spring members lying under each of said apertures, e. a first end of each of said spring members being fastened to said plate, f. the second end of each of said spring members and said plate having mutually attracting magnetic means thereon whereby said second end is attracted to and held against said plate, g. the resilience of said spring member biasing said second end toward said plate, h. first contact means on said second end of each of said spring members, i. second contact means located in operative relationship with said first contact means, j. key means in each of said apertures, said key means being adapted to put pressure on said spring means between the ends thereof whereby initial pressure on said key means will flex said spring member and additional pressure will break away said magnetic means and cause said contacts to change their operative relationship.
Claim 5
Dependent Claim
16 words
The keyboard of claim 1 wherein each of the elongated spring members is a leaf spring.
Claim 6
Dependent Claim
37 words
The keyboard of claim 1 wherein pressure on said key means causes said contact means to initially contact each other and whereby further pressure on said key means causes said contact means to wipe across each other.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |