Patent US3568337A successfully refreshed from Google Patents.
US3568337A
Expired / Lapsed
US
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Typist pacesetting device
Assignee: Battelle Development Corp
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Filing: 1968-04-17
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Granted: 1971-03-09
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Expires: 1988-04-17
Abstract
Abstract A PACESETTING APPARATUS FOR IMPROVING TYPING SKILLS INCLUDING A MEANS FOR AFFECTING RELATIVE MOTION BETWEEN A COPY SHEET AND A MASKING MEMBER HAVINA AN ELONGATED OPENING OR TRANSPARENT WINDOW AT A CONSTANT PREDETERMINED RATE. VARIOUS TYPE SYMBOLS ARE ARRANGED ON THE COPY SHEET IN LINES WHICH SLANT FROM LEFT TO RIGHT. THE VARIOUS SYMBOLS SUCCESSIVELY BECOME VISIBLE THROUGH THE OPENING OR TRANSPARENT WINDOW FOR A PREDETERMINED PERIOD OF TIME AS THE MASKING MEMBER ACHIEVES RELATIVE MOTION WITH RESPECT TO THE COPY SHEET.
Inventors
- 👤 Walter M Sharp Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:19
CPC Classifications
G; G09; G09B; G09B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |