Patent US3158479A successfully refreshed from Google Patents.
US3158479A
Expired / Lapsed
US
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Method of production halftones
Assignee: PLUESS LITHOGRAPH CO
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Filing: 1963-03-14
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Granted: 1964-11-24
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Expires: 1983-03-14
Abstract
No abstract record available.
Inventors
- 👤 Pluess Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:12
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/02; G03F5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD WHICH COMPRISES PROJECTING A CONTINUOUS-TONE LIGHT IMAGE ONTO A LIGHT-SENSITIVE SURFACE THROUGH A HALFTONE SCREEN FOR ONE EXPOSURE TURNING THE SCREEN IN ITS PLANE THROUGH AN ANGLE OF FROM ABOUT 28* TO ABOUT 37*, AGAIN PROJECTING THE IMAGE ON THE LIGHTSENSITIVE SURFACE THROUGH THE SCREEN IN ITS NEW POSITION FOR ANOTHER EXPOSURE AND DEVELOPING AND FIXING THE EXPOSED LIGHT-SENSITIVE SURFACE.
Claim 2
Independent Claim
62 words
THE METHOD WHICH COMPRISES PROJECTING A CONTINUOUS-TONE LIGHT IMAGE ONTO A LIGHT-SENSITIVE SURFACE THROUGH A HALFTONE SCREEN FOR ONE EXPOSURE TURNING THE SCREEN IN ITS PLANE THROUGH AN ANGLE OF FROM ABOUT 28* TO ABOUT 37*, AGAIN PROJECTING THE IMAGE ON THE LIGHTSENSITIVE SURFACE THROUGH THE SCREEN IN ITS NEW POSITION FOR ANOTHER EXPOSURE AND DEVELOPING AND FIXING THE EXPOSED LIGHT-SENSITIVE SURFACE.
References Cited (Backward Citations)
US1524499A
Cited
US1577442A
Cited
US2776595A
Cited
US2703281A
Cited
GB881742A
Cited
US3085878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |