US3594159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic copying method employing development on side of the imaging sheet opposite the photoconductive coating
Assignee: Individual
•
Filing: 1970-03-09
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Granted: 1971-07-20
•
Expires: 1990-03-09
Abstract
Abstract METHOD AND APPARATUS FOR ELECTROSTATIC REPRODUCTION OF INDICIA, WHEREIN A SHEET OF RECORD MATERIAL HAVING AN INSULATING SUBSTRATE AND A COATING OF PHOTOCONDUCTIVE MATERIAL ON ONE SIDE THEREOF IS ELECTRICALLY CHARGED, THE PHOTOCONDUCTIVE SIDE IS THEN EXPOSED TO LIGHT COMING FROM THE INDICIA TO FORM A LATENT IMAGE, AN ELECTRICAL CONNECTION IS ESTABLISHED BETWEEN THE EXPOSED PHOTOCONDUCTIVE COATING AND A BODY OF ELECTROSTATICALLY ATTRACTABLE TONER, THE TONER IS APPLIED TO THE SUBSTRATE ON THE SIDE OPPOSITE THE PHOTOCONDUCTIVE COATING TO RENDER THE LATENT IMAGE VISIBLE.
Inventors
- 👤 Arthur L Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/06; G03G15/08; G03G15/09; G03G15/0914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |