Patent US3330909A successfully refreshed from Google Patents.
US2884348A
Expired / Lapsed
US
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Erasure of imprinted magnetic markings
Assignee: International Business Machines Corp
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Filing: 1957-02-26
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Granted: 1959-04-28
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Expires: 1977-02-26
Abstract
No abstract record available.
Inventors
- 👤 Kulesza Frank William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/855; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G9/083; G03G9/0831; G03G9/0832; G03G9/0837; G06; G06K; G06K15/00; G06K15/02; G06K15/14; G11B5/62; G11B5/68; G11B5/70; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE METHOD OF ERASING CHARACTERS PRINTED WITH A COMPOSITION CONSISTING OF A MASS OF MICROSCOPIC GRANULES OF A HIGH PERMEABILITY MAGNETIC MATERIAL COATED WITH A THERMOPLASTIC MIXTURE WHICH CONSISTS OF HEATING THE PRINTED MEDIUM AND THEREAFTER LIFTING THE SAID COMPOSITION BY MAGNETIC FORCE.
Claim 2
Independent Claim
43 words
THE METHOD OF ERASING CHARACTERS PRINTED WITH A COMPOSITION CONSISTING OF A MASS OF MICROSCOPIC GRANULES OF A HIGH PERMEABILITY MAGNETIC MATERIAL COATED WITH A THERMOPLASTIC MIXTURE WHICH CONSISTS OF HEATING THE PRINTED MEDIUM AND THEREAFTER LIFTING THE SAID COMPOSITION BY MAGNETIC FORCE.
References Cited (Backward Citations)
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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) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |