US2965483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic contrast
Assignee: Xerox Corp
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Filing: 1958-09-23
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Granted: 1960-12-20
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Expires: 1978-09-23
Abstract
No abstract record available.
Inventors
- 👤 John F Byrne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/26; G03G15/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A XEROGRAPHIC METHOD OF IMPROVING THE TONAL CONTRAST IN A REPRODUCTION OF AN UNDEVELOPED ELECTROSTATIC CHARGE PATTERN TO REPRODUCE A POSITIVE REPRODUCTION FROM A POSITIVE ORIGINAL, THE IMPROVEMENT COMPRISING PRIOR TO DEVELOPMENT AND WHILE EXPOSING A XEROGRAPHIC PLATE TO A SINGLE PATTERN OF LIGHT AND SHADOW APPLYING A FIRST FIELD OF A GIVEN POLARITY THROUGH SAID PLATE AND THEN APPLYING WITH EXPOSURE TO THE SAME PATTERN IN REGISTER A SECOND FIELD OF SAID GIVEN POLARITY HAVING A GREATER INTENSITY THAN SAID FIRST FIELD THROUGH SAID PLATE SO AS TO CONTROL THE CONTRAST TO THE DESIRED DEGREE.
Claim 2
Dependent Claim
97 words
IN A XEROGRAPHIC METHOD OF IMPROVING THE TONAL CONTRAST IN A REPRODUCTION OF AN UNDEVELOPED ELECTROSTATIC CHARGE PATTERN TO REPRODUCE A POSITIVE REPRODUCTION FROM A POSITIVE ORIGINAL, THE IMPROVEMENT COMPRISING PRIOR TO DEVELOPMENT AND WHILE EXPOSING A XEROGRAPHIC PLATE TO A SINGLE PATTERN OF LIGHT AND SHADOW APPLYING A FIRST FIELD OF A GIVEN POLARITY THROUGH SAID PLATE AND THEN APPLYING WITH EXPOSURE TO THE SAME PATTERN IN REGISTER A SECOND FIELD OF SAID GIVEN POLARITY HAVING A GREATER INTENSITY THAN SAID FIRST FIELD THROUGH SAID PLATE SO AS TO CONTROL THE CONTRAST TO THE DESIRED DEGREE.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |