Patent US3647541A successfully refreshed from Google Patents.
US3647541A
Expired / Lapsed
US
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Process for applying a magnetic track directly on an antihalation backing of a cinematographic film
Assignee: Eastman Kodak Co
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Filing: 1970-05-28
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Granted: 1972-03-07
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Expires: 1990-05-28
Abstract
Abstract A magnetic sound track is applied on the antihalation backing layer of a cinematographic film, such as cellulose acetate, by coating the magnetic particles from a solution containing a polymeric binder (such as nitrocellulose) dissolved in a solvent mixture consisting essentially of about 15 to 35 percent of a dioxane (such as 1,4-dioxane or 4-methyl-1,3-dioxane) and 65 to 85 percent of 2-methoxy ethanol, by weight. This track is firmly adhered to the support and is irremovable by alkaline photographic processing solutions which remove the backing layer. Moreover, undesirable curl of the film, and cracking of the magnetic stripe are avoided with this solvent mixture.
Inventors
- 👤 Rene Prevot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:59
CPC Classifications
G; G03; G03D; G03D15/00; G11; G11B; G11B5/00; G11B5/74; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
14 words
A process in accordance with claim 1 wherein said dioxane is 1,4-dioxane or 4-methyl-1,3-dioxane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |