Patent USRE27912E successfully refreshed from Google Patents.
USRE27912E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scum-retardant carrier particles and compositions thereof
Assignee: —
•
Filing: 1971-12-23
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Granted: 1974-02-05
•
Expires: 1991-12-23
Abstract
Abstract MAGNETICALLY RESPONSIVE CARRIER PARTICLES FOR USE IN MAGNETIC-BRUSH DEVELOPMENT OF ELECTROSTATIC IMAGES, COMPRISING A CORE OF FERROMAGNETIC MATERIAL OVERCOATED WITH A THIN, CONTINUOUS LAYER OF A FILM-FORMING, ALKALI-SOLUBLE CARBOXYLATED POLYMER. THE PARTICLES HAVE A REDUCED TENDENCY TO CAUSE SCUM FORMATION ON THE SURFACE OF A PHOTOCONDUCTIVE ELEMENT.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1133; G03G9/1135; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |