US2986521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversal type electroscopic developer powder
Assignee: RCA Corp
•
Filing: 1958-03-28
•
Granted: 1961-05-30
•
Expires: 1978-03-28
Abstract
No abstract record available.
Inventors
- 👤 Wielicki Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09725; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
A REVERSAL TYPE DEVELOPER POWDER FOR ELECTROSTATIC PRINTING COMPRISING 50 TO 85 PARTS BY WEIGHT OF A PARTICULATE FRENCH PROCESS ZINC OXIDE HAVING A SURFACE PHOTOCONDUCTIVITY OF ABOUT 10-9 OHM-1/SQUARE/WATT/CM.2 AT A WAVELENGTH OF ABOUT 3900 A., 15 TO 50 PARTS BY WEIGHT OF AN ELECTROSCOPIC COATING ON THE PARTICLES OF SAID ZINC OXIDE CONSISTING OF A THERMOPLASTIC INSULATING MATERIAL HAVING A MELTING POINT SUBSTANTIALLY WITHIN A RANGE OF FROM 90*C. TO 250*C. AND A VISCOSITY SUBSTANTIALLY WITHIN A RANGE OF FROM 45 TO 10,000 CENTIPOISES AT A TEMPERATURE SLIGHTLY ABOVE SAID MELTING POINT, AND AN ADDITIONAL COATING ON SAID PARTICLES CONSISTING ESSENTIALLY OF 11/2 TO 9 PARTS BY WEIGHT OF A FINELY-DIVIDED COLLOIDAL SILICA, SAID THERMOPLASTIC, INSULATING MATERIAL HAVING A POSITIVE TRIBOELECTRIC RELATIONSHIP WITH RESPECT TO SAID COLLOIDAL SILICA.
References Cited (Backward Citations)
US1952886A
Cited
US2277393A
Cited
US2303330A
Cited
US2585461A
Cited
US2638416A
Cited
US2753308A
Cited
US2735784A
Cited
US2839400A
Cited
US2758939A
Cited
US2785990A
Cited
US2892794A
Cited
US2901427A
Cited
US2877133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |