Patent US2879397A successfully refreshed from Google Patents.
US2879397A
Expired / Lapsed
US
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Image development
Assignee: Xerox Corp
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Filing: 1955-12-19
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Granted: 1959-03-24
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Expires: 1975-12-19
Abstract
No abstract record available.
Inventors
- 👤 Lehmann Ernest Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:53
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A XERORADIOGRAPHIC INSPECTION METHOD INCLUDING UNIFORMLY CHARGING A PHOTOCONDUCTIVE UNSULATING LAYER OVERLYING A CONDUCTIVE BACKING SURFACE, EXPOSING SAID LAYER TO A PATTERN OF PENETRATING RADIATION TO FORM A CHARGE PATTERN THEREON, AND DEVELOPING SAID SURFACE BY DEPOSITING THEREON FINELY DIVIDED CHARGED POWDER PARTICLES IN ACCORDANCE WITH THE ELECTROSTATIC FIELD ASSOCIATED WITH SAID CHARGE PATTERN, THE IMPROVEMENT COMPRISING AGAIN DEVELOPING SAID SURFACE, WHILE SAID POWDER AND CHANGE PATTERN REMAIN THEREON, BY DEPOSITING THEREON IN ACCORDANCE WITH THE ELECTROSTATIC FIELD ASSOCIATED WITH SAID CHARGE PATTERN PARTICLES OF ANOTHER FINELY DIVIDED POWDER OF COLOR DIFFERENT FROM AND CHARGE POLARITY OPPOSITE TO THAT ORIGINALLY USED.
Claim 2
Dependent Claim
102 words
IN A XERORADIOGRAPHIC INSPECTION METHOD INCLUDING UNIFORMLY CHARGING A PHOTOCONDUCTIVE UNSULATING LAYER OVERLYING A CONDUCTIVE BACKING SURFACE, EXPOSING SAID LAYER TO A PATTERN OF PENETRATING RADIATION TO FORM A CHARGE PATTERN THEREON, AND DEVELOPING SAID SURFACE BY DEPOSITING THEREON FINELY DIVIDED CHARGED POWDER PARTICLES IN ACCORDANCE WITH THE ELECTROSTATIC FIELD ASSOCIATED WITH SAID CHARGE PATTERN, THE IMPROVEMENT COMPRISING AGAIN DEVELOPING SAID SURFACE, WHILE SAID POWDER AND CHANGE PATTERN REMAIN THEREON, BY DEPOSITING THEREON IN ACCORDANCE WITH THE ELECTROSTATIC FIELD ASSOCIATED WITH SAID CHARGE PATTERN PARTICLES OF ANOTHER FINELY DIVIDED POWDER OF COLOR DIFFERENT FROM AND CHARGE POLARITY OPPOSITE TO THAT ORIGINALLY USED.
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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |