US3669872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging system
Assignee: Xerox Corp
•
Filing: 1970-01-29
•
Granted: 1972-06-13
•
Expires: 1990-01-29
Abstract
Abstract A method of selectively producing positive or negative photoelectrophoretic copies is described. A suspension of photosensitive particles sensitive to a first range of wavelengths is placed between two electrodes, one of which is transparent and the other of which has a surface sensitive to a second range of wavelengths. When a field is imposed across the suspension and an image is projected through the transparent electrode using radiation in only one of said first and second ranges, a positive or negative image is formed on a given electrode, depending on whether the electrode or the suspension is sensitive to the radiation used.
Inventors
- 👤 Vsevolod Tulagin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/24; G03G15/14; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
The apparatus of claim 1 and further including light filtering means for limiting the wavelength range of the activating electromagnetic radiation.
Claim 2
Dependent Claim
32 words
The apparatus of claim 1 wherein said electrically photosensitive layer is sensitive to radiation of wavelengths other than the wavelengths to which an imaging suspension adjacent said electrically photosensitive layer is sensitive.
References Cited (Backward Citations)
US3565614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |