Patent US3158805A successfully refreshed from Google Patents.
US3158805A
Expired / Lapsed
US
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Method and apparatus for magnetically marking sheet steel by deposition of metal ions
Assignee: Individual
•
Filing: 1958-06-02
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Granted: 1964-11-24
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Expires: 1978-06-02
Abstract
No abstract record available.
Inventors
- 👤 David C Kalbfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:09
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
IN COMBINATION: FIRST AND SECOND MAGNETIZABLE METALLIC MEANS HAVING FIRST AND SECOND PERMEABILITY VALUES, RESPECTIVELY; MEANS FOR ALLOYING A PORTION OF SAID FIRST MAGNETIZABLE MEANS WITH SAID SECOND MAGNETIZABLE MEANS AT A PREDETERMINED SURFACE PART WHEREBY SAID PREDETERMINED PART HAS A PERMEABILITY VALUE DIFFERING FROM SAID FIRST PERMEABILITY VALUE OF THE REMAINING SURFACE PART; AND PERMEABILITY DIFFERENCE DETECTING MEANS RESPECTIVELY ASSOCIATED WITH SAID REMAINING SURFACE PART OF THE
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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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |