US3607357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink receptive convertible films and process for their preparation
Assignee: International Business Machines Corp
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Filing: 1968-08-05
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Granted: 1971-09-21
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Expires: 1988-08-05
Abstract
Abstract Ink receptive convertible films suitable for use in copying systems or projection slides are prepared by coating the surface of a transparent film with a fusible polymer material such as polyvinyl acetate with a pore forming agent such as ammonium carbonate. The polymer containing the pore forming agent to volatilize and render the film porous, and ink receptive. The film is then readily printed with a conventional ink after which the nonprinted portion of the opaque coating is rendered transparent through the application of heat and/or pressure, or the action of solvent vapors. The printed matter substantially retains the print quality it possessed during the ink receptive opaque stage.
Inventors
- 👤 Hugh T Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:53
CPC Classifications
C; C09; C09D; C09D5/00
Claims Analysis
Total Claims: 0
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |