US2793135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for preparing a latent magnetic image
Assignee: Unisys Corp
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Filing: 1955-12-01
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Granted: 1957-05-21
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Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Jr John C Sims
- 👤 Clyde A Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:44
CPC Classifications
G; G03; G03G; G03G19/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE METHOD OF PREPARING A PRINTNG SURFACE WHICH COMPRISES APPLYING A PATTERN OF HEAT GRADIENTS TO A UNIFORMLY MAGNETIZED SURFACE THEREBY TO SELECTIVELY DEMAGNETIZE PORTIONS OF SAID SURFACE IN ACCORDANCE WITH INTELLIGENCE TO BE REPRODUCED.
Claim 2
Dependent Claim
22 words
THE METHOD OF CLAIM 2 INCLUDING THE FURTHER STEP OF APPLYING A MAGNETIC INK TO SAID SURFACE SUBSEQUENT TO SAID SELECTIVE DEMAGNETIZATION.
References Cited (Backward Citations)
US2693416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |