US2530956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording
Assignee: AT&T Inc
•
Filing: 1946-08-06
•
Granted: 1950-11-21
•
Expires: 1966-08-06
Abstract
No abstract record available.
Inventors
- 👤 Robert B Gibney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:01
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; Y; Y10; Y10S; Y10S101/00; Y10S101/29; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31768; Y10T428/31772; Y10T428/31775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AN ELECTROGRAPHIC RECORDING MEDIUM COMPRISING TWO ESSENTIALLY DRY PAPAER SHEETS IN FACE TO FACE CONTACT, EACH IMPREGNATED WITH A MIXTURE OF ACETAMIDE AND FORMAMIDE IN THE PROPORTIONS OF ABOUT 100 PARTS OF THE FORMER TO 10 PARTS OF THE LATTER, ONE OF SAID SHEETS BEING ALSO IM-
Claim 2
Dependent Claim
47 words
AN ELECTROGRAPHIC RECORDING MEDIUM COMPRISING TWO ESSENTIALLY DRY PAPAER SHEETS IN FACE TO FACE CONTACT, EACH IMPREGNATED WITH A MIXTURE OF ACETAMIDE AND FORMAMIDE IN THE PROPORTIONS OF ABOUT 100 PARTS OF THE FORMER TO 10 PARTS OF THE LATTER, ONE OF SAID SHEETS BEING ALSO IM-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |