US2739304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating device
Assignee: Research Corp
•
Filing: 1952-04-05
•
Granted: 1956-03-20
•
Expires: 1972-04-05
Abstract
No abstract record available.
Inventors
- 👤 Frank T John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:25
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933650A
Cited
US2086391A
Cited
US1967892A
Cited
US2257763A
Cited
US2278993A
Cited
US2432454A
Cited
US2440797A
Cited
US2477821A
Cited
US2600168A
Cited
US2633297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |