Patent US3573808A successfully refreshed from Google Patents.
US3573808A
Expired / Lapsed
US
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Keyboard or other similar apparatus for converting mechanical movement to a binary electrical signal using permanent magnet inhibited cores
Assignee: Potter Instrument Co Inc
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Filing: 1968-03-25
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Granted: 1971-04-06
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Expires: 1988-03-25
Abstract
Abstract The specification and claims disclose a keyboard for encoding information in a binary form in which a planar array of ferromagnetic cores are normally inhibited from switching by permanent magnets. One of the magnets is raised each time a key is struck and the cores adjacent this magnet are thereby uninhibited and produce an output indicative of the struck key.
Inventors
- 👤 Charles B Pear Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:01
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/0266; H04L25/0268; G; G11; G11C; G11C17/00; G11C17/02; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/97; H03K17/972
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
231 words
An apparatus for converting a mechanical movement to a binary electrical signal, comprising in combination: an array of discrete electromagnetic coupling elements arranged in groups; means coupled to said elements for energizing said elements; means coupled to said elements for providing an output from said elements; said elements respectively coupling said energizing means with said output means; information being stored as the presence or absence of certain ones of said elements in said groups of elements; a plurality of movable means for effecting the coupling of said elements of respective ones of said groups of elements, each of said movable means movable between a first position in which said individually movable means has a first effect on the coupling by the elements of said group, and a second position in which said individually movable means has a second different effect on the coupling by the elements of said group; at least one additional group of said coupling elements; means for energizing said additional group of coupling elements selectively and independently of the means for energizing the elements of said array; and said additional group of coupling elements being so disposed so at least one of said movable means in its first position is disposed to effect both the coupling of the elements of said additional group and the coupling of at least one group of said coupling elements of said array.
Claim 2
Independent Claim
231 words
An apparatus for converting a mechanical movement to a binary electrical signal, comprising in combination: an array of discrete electromagnetic coupling elements arranged in groups; means coupled to said elements for energizing said elements; means coupled to said elements for providing an output from said elements; said elements respectively coupling said energizing means with said output means; information being stored as the presence or absence of certain ones of said elements in said groups of elements; a plurality of movable means for effecting the coupling of said elements of respective ones of said groups of elements, each of said movable means movable between a first position in which said individually movable means has a first effect on the coupling by the elements of said group, and a second position in which said individually movable means has a second different effect on the coupling by the elements of said group; at least one additional group of said coupling elements; means for energizing said additional group of coupling elements selectively and independently of the means for energizing the elements of said array; and said additional group of coupling elements being so disposed so at least one of said movable means in its first position is disposed to effect both the coupling of the elements of said additional group and the coupling of at least one group of said coupling elements of said array.
Claim 3
Dependent Claim
47 words
An apparatus for converting mechanical movement to a binary electrical signal as in claim 1 wherein said groups are aligned in columns and the elements of said columns are aligned in rows and at least one of said rows has an element in each of said columns.
Claim 4
Dependent Claim
40 words
An apparatus for converting mechanical movement to a binary electrical signal as in claim 2 wherein the cores in adjacent columns in said row in which there is a core in each column are oriented so that their outputs add.
Claim 5
Dependent Claim
35 words
An apparatus for converting mechanical movement to a binary electrical signal as in claim 3 wherein said permanent magnets are made of magnetic rubber and further including manually operated keys for moving said movable means.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |