Patent US3798134A successfully refreshed from Google Patents.
US3798134A
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Method of making an electrotype shell
Assignee: Printing Plate Supply Co
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Filing: 1971-11-15
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Granted: 1974-03-19
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Expires: 1991-11-15
Abstract
Abstract AN ELECTROTYPE PRINTING SHELL IS MADE BY FIRST MAKING A NEGATIVE FILM OF THE SUBJECT MATTER TO BE PRINTED ND THEN MAKING A POSITIVE MASTER OF A PHOTOPOLYNMER PHOTO SENSITIVE MATERIAL FROM THE NEGATIVE FILM. A SOFT, FLOWABLE POLYMER MATERIAL IS THEN SPREAD OVER THE POSITIVE MASTER AND THE LIQUID MATERIAL IS THEN POLYMERIZED SUCH THAT A THIN MOLDED LAYER IS FORMED ON THE POSITIVE MASTER. THE THIN MOLDED LAYER IS THEN REMOVED AND SENSTIZED FOLLOWED BY ELECTROPLATING A PRINTING SHELL MATERIAL ON THE SENSITIVE MOLDED LAYER FUNCTIONING AS A MOLD. LASTLY, THE PRINTING SHELL IS REMOVED FROM THE MOLDED LAYER MOLD.
Inventors
- 👤 J Hynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:08
CPC Classifications
B; B41; B41C; B41C3/00; B41C3/08
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |