US3503296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual keyboard teaching device
Assignee: SCHMOYER CHARLES F
•
Filing: 1967-07-18
•
Granted: 1970-03-31
•
Expires: 1987-07-18
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Schmoyer
- 👤 James J Dozier Jr
- 👤 Richard H Bradford
- 👤 John E E Boswell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:16
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/06; G09G3/12; G09G3/14; G01; G01R; G01R13/00; G01R13/40; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/023; G09B; G09B13/00; G09B15/00; G09B15/08; G09G3/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2820391A
Cited
US3335630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |