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US2518458A
Expired / Lapsed
US
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Authenticating device
Assignee: Individual
•
Filing: 1944-08-25
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Granted: 1950-08-15
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Expires: 1964-08-25
Abstract
No abstract record available.
Inventors
- 👤 William F Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:11
CPC Classifications
G; G09; G09C; G09C1/00; G09C1/06; G09C1/10; G09C1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1683072A
Cited
US1584660A
Cited
US1938028A
Cited
US1953829A
Cited
US2080416A
Cited
US2139676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |