US3781210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic coating composition
Assignee: Memorex Corp
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Filing: 1972-05-16
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Granted: 1973-12-25
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Expires: 1992-05-16
Abstract
Abstract A FLUID, HEAT CURABLE THERMOSETTING MAGNETIC COATING COMPOSITION IN WHICH MAGNETIC PARTICLES ARE DISPERSED IN A SOLUTION OF FIVE COMPONENTS WHICH UPON EVAPORATION OF THE SOLVENT AND HEATING FORM A DURABLE RESIN MATRIX HAVING THE MAGNETIC PARTICLES DISPERSED IN IT. THE FIVE COMPONENTS IN SOLUTION ARE AN EPOXY RESIN HAVING A MOLECULAR WEIGHT OF ABOUT 400-4000 PER EPOXY GROUP, AN AMINE ALDEHYDE CONDENSATION PRODUCT CONTAINGING SECONDARY AMINE GROUPS, A POLYAMINE CONTAINING PRIMARY AMINE GROUPS, A POLYVINYL ACETAL RESIN, AND A SILANOL MODIFIED SILICONE RESIN.
Inventors
- 👤 V Lohoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023
Claims Analysis
Total Claims: 0
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |