Patent US3871506A successfully refreshed from Google Patents.
US3871506A
Expired / Lapsed
US
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Exchangeable keyboard for ball typewriters
Assignee: Individual
•
Filing: 1973-08-08
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Granted: 1975-03-18
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Expires: 1993-08-08
Abstract
Abstract An exchangeable keyboard for ball typewriters, adapted to be employed when the type ball of the typewriter is exchanged for another ball carrying characters which differ in respects other than that of letter type, with the keyboard consisting of indicia-bearing caps which are fitted over the typewriter keys, and including durable, elastic strips extending between the caps so as to bind these together to form an assembled or unitary arrangement.
Inventors
- 👤 Luders Kirill Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:23
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/10; B41J5/102
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
In an exchangeable keyboard least one ball typewriters, adapted for use upon the type ball of the typewriter being exchanged for another ball having indicia or characters thereon which differ from that of the first-mentioned ball, said keyboard including a plurality of caps adapted to be superimposed on respective of the typewriter keys, and at leastone durable elastic strip extending between adjacent ones of said caps so as to interconnect the latter into a single entity; the improvement comprising said caps each including a cap body portion, and a cover portion mounted on said body portion, said strip continuously extending along each row of keys for substantially the full length of the key row, said strip being fastened to each said cap intermediate the cap body and cover portions, notches formed in said strip, said strip being engaged in a form-fit attachment between each said cap body and cover portions in the region of said notches.
Claim 2
Dependent Claim
156 words
In an exchangeable keyboard least one ball typewriters, adapted for use upon the type ball of the typewriter being exchanged for another ball having indicia or characters thereon which differ from that of the first-mentioned ball, said keyboard including a plurality of caps adapted to be superimposed on respective of the typewriter keys, and at leastone durable elastic strip extending between adjacent ones of said caps so as to interconnect the latter into a single entity; the improvement comprising said caps each including a cap body portion, and a cover portion mounted on said body portion, said strip continuously extending along each row of keys for substantially the full length of the key row, said strip being fastened to each said cap intermediate the cap body and cover portions, notches formed in said strip, said strip being engaged in a form-fit attachment between each said cap body and cover portions in the region of said notches.
Claim 3
Dependent Claim
52 words
Exchangeable keyboard as claimed in claim 1, said cap cover portion being transparent, film means being positioned in said cap below said cover portion, and indicia or characters being printed on said film means in conformance with the indicia or characters on said other type ball facing upwardly toward said cover portion.
Claim 4
Dependent Claim
53 words
Exchangeable keyboard as claimed in claim 1, said cap cover portion being formed of material essentially similar to that of the keys on the typewriter keyboard, and indicia or characters being imprinted on the upper surfaces of said cover portions in correspondence with the indicia or characters provided on said other type ball.
Claim 5
Dependent Claim
27 words
Exchange keyboard as claimed in claim 1, comprising at least one said strip interconnecting caps of adjacent rows on said keyboard along one edge of said typewriter.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |