Photographic film with magnetic recording layer
Abstract
Abstract A MAGNETIC RECORDING MEMBER SUCH AS TAPE OTR STRIPED MOTION PICTURE FILM WHEREIN A LAYER OF FERROMAGNETIC PARTICLES IS BOUND ON A SYNTHETIC RESIN WEB BY A BINDER CONSISTING ESSENTIALLY OF CELLULOSE NITRATE IN INTIMATE MIXTURE WITH A POLYMERIC COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, 50-80% VINYLIDENE CHLORIDE, 2-30% ACRYLONITRILE, AND 0-60% OF METHYL METHACRYLATE OR ACRYLATE OR HYDROXY PROPYL METHACRYLATE. THIS BINDER IS ESPECIALLY GOOD FOR POLY(ETHYLENE TEREPHTHALATE) WEBS. BEST ADHERENCE TO A WEB IS SECURED WHEN THE FERROMAGNETIC PARTICLES AND THE ABOVE BINDER ARE DEPOSITED FROM AN ORGANIC SOLVENT WHEREIN AT LEAST 8% OF THE SOLVENT IS N,NDIMETHYL FORMAMIDE OR ACETAMIDE.
Inventors
- 👤 R Stimson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |