Patent US3160879A successfully refreshed from Google Patents.
US2891011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer for electrostatic images
Assignee: Xerox Corp
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Filing: 1956-12-26
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Granted: 1959-06-16
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Michael A Insalaco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:07
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08726; G03G9/08728; G03G9/08742; G03G9/08746; G03G9/08748; G03G9/08775; G03G9/09; G03G9/0902; G03G9/0906; G03G9/0912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AS A COMPOSITION OF MATTER, A XEROGRAPHIC DEVELOPING POWDER CONSISTING ESSENTIALLY OF BETWEEN ABOUT 2% TO ABOUT 20% OF A ZINC SALT OF 8-HYDROXYQUINOLINE, BETWEEN ABOUT 2% TO ABOUT 10% OF A DYE SELECTED FROM THE GROUP CONSISTING OF PRUSSIAN BLUE AND MALACHITE GREEN AND THE BALANCE OF SAID COMPOSITION BEING A RESIN SELECTED FROM THE GROUP CONSISTING OF (A) A ROSIN-MODIFIED PHENOL-FORMALDEHYDE RESIN CONTAINING ABOUT 5% TO 45% POLYVINYL BUTYRAL, THE ROSIN-MODIFIED PHENOL-FORMALDEHYDE BEING PREPARED USING FROM ABOUT 1 TO 8 PARTS ROSIN FOR EACH PART OF PHENOL-FORMALDEHYDE BASE AND HAVING A RING AND BALL MELTING POINT OF ABOUT 140 TO 180* C.; (B) A RESIN BLEND OF UP TO 25% POLYMERIZED BUTYL METHACRYLATE BLENDED WITH A POLYMERIZED BLEND OF MONOMERS OF STYRENE AND STYRENE HOMOLOGS OF THE FORMULA:
Claim 2
Dependent Claim
130 words
AS A COMPOSITION OF MATTER, A XEROGRAPHIC DEVELOPING POWDER CONSISTING ESSENTIALLY OF BETWEEN ABOUT 2% TO ABOUT 20% OF A ZINC SALT OF 8-HYDROXYQUINOLINE, BETWEEN ABOUT 2% TO ABOUT 10% OF A DYE SELECTED FROM THE GROUP CONSISTING OF PRUSSIAN BLUE AND MALACHITE GREEN AND THE BALANCE OF SAID COMPOSITION BEING A RESIN SELECTED FROM THE GROUP CONSISTING OF (A) A ROSIN-MODIFIED PHENOL-FORMALDEHYDE RESIN CONTAINING ABOUT 5% TO 45% POLYVINYL BUTYRAL, THE ROSIN-MODIFIED PHENOL-FORMALDEHYDE BEING PREPARED USING FROM ABOUT 1 TO 8 PARTS ROSIN FOR EACH PART OF PHENOL-FORMALDEHYDE BASE AND HAVING A RING AND BALL MELTING POINT OF ABOUT 140 TO 180* C.; (B) A RESIN BLEND OF UP TO 25% POLYMERIZED BUTYL METHACRYLATE BLENDED WITH A POLYMERIZED BLEND OF MONOMERS OF STYRENE AND STYRENE HOMOLOGS OF THE FORMULA:
References Cited (Backward Citations)
US2753308A
Cited
US2788288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-15 | 1962-12-15 | 1963-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-15 | 1966-12-15 | 1967-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-15 | 1970-12-15 | 1971-06-16 | $7700.00 | Window Closed / Lapsed |