US3690946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of magnetic recording media
Assignee: JOB WERNER HARTMANN
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Filing: 1970-02-16
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Granted: 1972-09-12
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Expires: 1990-02-16
Abstract
Abstract MAGNETIC RECORDING MEDIA AND PROCESS FOR THEIR MANUFACTURE BY COATING A NON-MAGNETIC SUPPORT WITH A DISPERSION OF MAGNETIC PIGMENT IN A BINDER BASED ON A REACTIVE MIXTURE OF (A) A POLYISOCYANATE AND (B) A HYDROXYL GROUP-CONTAINING COPOLYMER PREPARED BY SOLUTION POLYMERIZATION FROM(1) HYDROXYALKYL ACRYLATE OR METHACRYLATE, (2) ALKYL ACRYLATE OR METHACRYLATE, (3) VINYLIDENE CHLORIDE AND, IF DESIRED, (4) A FURTHER MONOMER, SUCH AS ACRYLONITRILE, IN CERTAIN PROPORTIONS, AND CURING THE APPLIED COATING.
Inventors
- 👤 Heinrich Hartmann
- 👤 Job-Werner Hartmann
- 👤 Hans Wilhelm
- 👤 Georg Schnell
- 👤 Wolfram Kittler
- 👤 Gerhard Werst
- 👤 Reinhold Baur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6275; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31573; Y10T428/31576; Y10T428/3158; Y10T428/31609; Y10T428/31855; Y10T428/31935
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |