US3684551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pressure sensitive copying sheets
Assignee: Individual
•
Filing: 1970-04-15
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Granted: 1972-08-15
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Expires: 1990-04-15
Abstract
Abstract DISCLOSED HEREIN ARE VARIOUS FILMS CONTAINING MINUTE DROPLETS OF AN ENTRAPPED AND PREFERABLY VOLATILIZABLE LIQUID WHICH IS A NON-SOLVENT FOR THE POLYMERIC MATERIAL OF THE FILM MATRIX. UPON THE APPLICATION OF PRESSURE, AS BY A TYPEWRITER KEY, TO THE FILM, THE CELLS OF THE FILM WHICH CONTAIN THE DROPLETS OF LIQUID NON-SOLVENT ARE RUPTURED IN THE AREA OF PRESSURE. THIS RUPTURING ENABLES THE LIQUID NON-SOLVENT TO ESCAPE, AND RENDERS THE FILMS OPAQUE IN THE AREA OF RUPTURE AND RELEASE OF NON-SOLVENT. SUCH FILMS ARE USEFUL, FOR EXAMPLE, AS COATINGS ON TYPEWRITER OR OTHER PRINTING PAPER.
Inventors
- 👤 Jerome A Seiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:02
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; B41M5/124; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |