Patent US2547838A successfully refreshed from Google Patents.
US2547838A
Expired / Lapsed
US
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Record bearing medium and methods of preparation
Assignee: Individual
•
Filing: 1948-11-26
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Granted: 1951-04-03
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Expires: 1968-11-26
Abstract
No abstract record available.
Inventors
- 👤 Russell Edward Wriothes Curzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:23
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; H; H04; H04L; H04L13/00; H04L13/02; H04L13/06; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2254933A
Cited
US2288862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |