US2862816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for reducing triboelectric forces in electrophotography
Assignee: RCA Corp
•
Filing: 1954-03-26
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Granted: 1958-12-02
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Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 Alexander J Moncrieff-Yeates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:45
CPC Classifications
G; G03; G03G; G03G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD OF RENDERING VISIBLE AN ELECTROSTATIC IMAGE WITH A DEVELOPER POWDER WHICH COMPRISES POSITIONING THE ELECTROSTATIC IMAGE BETWEEN AN UPPER ELECTRODE AND A LOWER ELECTRODE HAVING ON ITS UPPER SURFACE A COSTING OF A MATERIAL COMPRISING A CONTINUOUS FILM INTEGRAL WITH SAID SURFACE, SAID MATERIAL HAVING A POSITION IN THE TRIBOELECTRIC SERIES SUBSTANTIALLY THE SAME AS THE POSITION OF THE DEVELOPER POWDER MATERIAL AND HAVING A THIN LAYER OF SAID DEVELOPER POWDER RESTING UPON THE UPPER SURFACE OF SAID COATING AND APPLYING A VOLTAGE BETWEEN THE ELECTRODES WHEREBY THE POWDER BECOMES CHARGED AND IS ATTRACTED TO AND DEPOSITS UPON THE ELECTROSTATIC IMAGE PRODUCING A VISIBLE IMAGE.
Claim 2
Independent Claim
107 words
A METHOD OF RENDERING VISIBLE AN ELECTROSTATIC IMAGE WITH A DEVELOPER POWDER WHICH COMPRISES POSITIONING THE ELECTROSTATIC IMAGE BETWEEN AN UPPER ELECTRODE AND A LOWER ELECTRODE HAVING ON ITS UPPER SURFACE A COSTING OF A MATERIAL COMPRISING A CONTINUOUS FILM INTEGRAL WITH SAID SURFACE, SAID MATERIAL HAVING A POSITION IN THE TRIBOELECTRIC SERIES SUBSTANTIALLY THE SAME AS THE POSITION OF THE DEVELOPER POWDER MATERIAL AND HAVING A THIN LAYER OF SAID DEVELOPER POWDER RESTING UPON THE UPPER SURFACE OF SAID COATING AND APPLYING A VOLTAGE BETWEEN THE ELECTRODES WHEREBY THE POWDER BECOMES CHARGED AND IS ATTRACTED TO AND DEPOSITS UPON THE ELECTROSTATIC IMAGE PRODUCING A VISIBLE IMAGE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |