Patent US2435130A successfully refreshed from Google Patents.
US2435130A
Expired / Lapsed
US
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Cryptographic attachment for typewriter keys
Assignee: Individual
•
Filing: 1944-10-05
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Granted: 1948-01-27
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Expires: 1964-10-05
Abstract
No abstract record available.
Inventors
- 👤 Roy N Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:53
CPC Classifications
G; G09; G09C; G09C3/00; G09C3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US442674A
Cited
US527112A
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US1003361A
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US1086823A
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US1093372A
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US1203570A
Cited
CH97890A
Cited
US1541043A
Cited
US1718694A
Cited
US2085166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-26 | 1951-07-28 | 1952-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-26 | 1955-07-28 | 1956-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-26 | 1959-07-28 | 1960-01-27 | $7700.00 | Window Closed / Lapsed |