US3728262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic tape lacquer
Assignee: US Philips Corp
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Filing: 1971-03-08
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Granted: 1973-04-17
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Expires: 1991-03-08
Abstract
Abstract A METHOD OF MANUFACTURING A MAGNETIC TAPE LACQUER IN WHICH A POLYMER IS USED AS A DISPERSING AGENTT FOR THE MAGNETISABLE PARTICLES. WHEN USING HYDROLIZED VINYLCHLORIDE-VINYL ACETATE, SUITABLE SOLVENTS ARE 1,2-DICHLOROETHANE, DIISOBUTYLKETONE AND NITROBENZENE.
Inventors
- 👤 H Lemmen
- 👤 Ruler J Van
- 👤 P Scholten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/7013
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |