US2422103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex calculating machine
Assignee: —
•
Filing: —
•
Granted: 1947-06-10
•
Expires: 1964-06-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:34
CPC Classifications
G; G06; G06C; G06C11/00; G06C15/00; G06C15/04; G06C15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1608145A
Cited
US1793155A
Cited
US1865147A
Cited
US1039130A
Cited
US823474A
Cited
US1016276A
Cited
US1209857A
Cited
US1455555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |