US2597538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accounting device
Assignee: Communication Engineering Pty Ltd
•
Filing: 1950-04-05
•
Granted: 1952-05-20
•
Expires: 1970-04-05
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Skillman
- 👤 Alan D Lackey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938526A
Cited
US2062119A
Cited
US2172078A
Cited
US2195850A
Cited
US2338206A
Cited
US2477722A
Cited
US2434500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |