US2500507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for teaching of typewriting
Assignee: Individual
•
Filing: 1947-04-07
•
Granted: 1950-03-14
•
Expires: 1967-04-07
Abstract
No abstract record available.
Inventors
- 👤 Thaddeus C Avery
- 👤 Avery Mildred Gilchrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:13
CPC Classifications
G; G09; G09B; G09B13/00; G09B13/02
Claims Analysis
Total Claims: 0
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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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |