US2987397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of prescreening of film
Assignee: Eastman Kodak Co
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Filing: 1958-03-10
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Granted: 1961-06-06
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Expires: 1978-03-10
Abstract
No abstract record available.
Inventors
- 👤 Richard E Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:35
CPC Classifications
G; G03; G03F; G03F5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
147 words
THE METHOD OF PRESCREENING CLAYDEN SENSITIVE PHOTOGRAPHIC FLIM WHICH COMPRISES PLACING SUBSTANTIALLY IN CONTACT WITH THE FLIM A UNIFORM HALFTONE TINT OF EFFECTIVELY OPAQUE APPROXIMATELY SHARP DOT CENTERS, EACH COVERING 1 TO 10 PERCENT OF THE TOTAL DOT AREA, PLACING A SHARP CROSS-LINE HALFTONE SCREEN AT ABOUT HALFTONE DISTANCE IN FRONT OF THE TINT AND FILM WITH THE INTERSECTIONS OF THE CROSSLINES REGISTERED IN FRONT OF THE DOT CENTERS, EXPOSING THE FILM SIMULTANEOUSLY THROUGH THE SCREEN AND THE TINT TO A HIGH INTENSITY SHORT DURATION UNIFORM EXPOSURE OF SUFFICIENT INTENSITY AND SUFFICIENTLY SHORT DURATION TO PRODUCE A CLAYDEN DESENSITIZATION, BETWEEN .05 AND .3 IN EQUIVALENT LOG E UNITS, NEAR THE EDGES OF SAID TINT DOT CENTERS AND TO PRODUCE ADDITIONAL CLAYDEN DESENSITIZATION UP TO A MAXIMUM, BETWEEN .6 AND 1.6 IN EQUIVALENT LOG E UNITS, AT THE DOT CORNERS ALIGNED WITH THE APERTURES OF SAID CROSSLINE SCREEN.
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |