US2666515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural keyboard typewriting machine
Assignee: Imperial Typewriter Co Ltd
•
Filing: 1950-12-19
•
Granted: 1954-01-19
•
Expires: 1970-12-19
Abstract
No abstract record available.
Inventors
- 👤 Brumhill Claude Wellington
- 👤 Pateman Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:14
CPC Classifications
B; B41; B41J; B41J3/00; B41J3/54; Y; Y10; Y10S; Y10S400/00; Y10S400/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1151730A
Cited
US1349864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |