Patent US3253352A successfully refreshed from Google Patents.
US3253352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable keyboard
Assignee: PALISADES EDUCATIONAL FOUNDATION Inc
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Filing: 1965-08-31
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Granted: 1966-05-31
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Expires: 1985-08-31
Abstract
No abstract record available.
Inventors
- 👤 Kobler Richard
- 👤 Stanley K Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:01
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/10; B41J5/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A KEY SELECTOR DEVICE FOR THE KEYBOARD OF A TYPEWRITER INCLUDING A COVER PLATE, MEANS FOR MOUNTING SAID PLATE IN A POSITION OVERLYING SAID KEYBOARD, SAID PLATE HAVING INDIVIDUAL HOLES ALIGNED WITH THE RESPECTIVE KEYS OF THE TYPEWRITER, REMOVABLY FILLER PLUGS MOUNTED IN SELECTED ONES OF SAID HOLES FOR CONCEALING RESPECTIVE KEYS
Claim 2
Dependent Claim
52 words
A KEY SELECTOR DEVICE FOR THE KEYBOARD OF A TYPEWRITER INCLUDING A COVER PLATE, MEANS FOR MOUNTING SAID PLATE IN A POSITION OVERLYING SAID KEYBOARD, SAID PLATE HAVING INDIVIDUAL HOLES ALIGNED WITH THE RESPECTIVE KEYS OF THE TYPEWRITER, REMOVABLY FILLER PLUGS MOUNTED IN SELECTED ONES OF SAID HOLES FOR CONCEALING RESPECTIVE KEYS
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |