US2970299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording with magnetic material
Assignee: Unisys Corp
•
Filing: 1955-05-20
•
Granted: 1961-01-31
•
Expires: 1975-05-20
Abstract
No abstract record available.
Inventors
- 👤 Epstein Herman
- 👤 Oscar B Stram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:30
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G19/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2784392A
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US2736770A
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US2710396A
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US2803758A
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US2857290A
Cited
US2846333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |