US5496674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particles suitable as carriers for electrophotography
Assignee: BASF SE
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Filing: 1992-12-05
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Granted: 1996-03-05
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Expires: 2012-12-05
Abstract
Abstract Particles (I) which are suitable as carriers for electrophotography consist of a) a magnetic core and b) a shell of alumina, chromium oxide, molybdenum oxide, tungsten oxide, silica, tin oxide or zirconium oxide or a mixture thereof and particles (II) consist of a) a magnetic core and b) a shell of titanium oxide and are obtainable by decomposing a titanium tetraalcoholate in the gas phase by reaction with steam and/or oxygen in the presence of agitated cores, and these particles are used in electrophotographic two-component developers.
Inventors
- 👤 Joerg Adel
- 👤 Norbert Mronga
- 👤 Erwin Czech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1131; G03G9/1139; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
24 words
Carrier particles for electrophotography consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof.
Claim 2
Dependent Claim
24 words
Carrier particles for electrophotography consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof.
Claim 3
Dependent Claim
13 words
Carrier particles as claimed in claim 1, wherein the shell is molybdenum oxide.
Claim 4
Dependent Claim
13 words
Carrier particles as claimed in claim 1, wherein the shell is tungsten oxide.
Claim 5
Dependent Claim
22 words
Carrier particles as claimed in claim 1, wherein the magnetic core is iron, steel, magnetite, ferrite, cobalt, nickel or neodymium iron boride.
Claim 6
Dependent Claim
33 words
An electrophotographic two-component developer, comprising carrier particles consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or tin oxide or a mixture thereof, and toner particles.
Claim 7
Dependent Claim
33 words
An electrophotographic two-component developer, comprising carrier particles consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or tin oxide or a mixture thereof, and toner particles.
Claim 8
Dependent Claim
18 words
The two-component developer as claimed in claim 5, wherein the shell of the carrier particles is molybdenum oxide.
Claim 9
Dependent Claim
18 words
The two-component developer as claimed in claim 5, wherein the shell of the carrier particles is tungsten oxide.
Claim 10
Dependent Claim
18 words
The two-component developer as claimed in claim 5, wherein the shell of the carrier particles is tin oxide.
Claim 11
Dependent Claim
80 words
A process for the preparation of carrier particles for electrophotography consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof, consisting of decomposing a volatile metal compound selected from the group consisting of compounds of molybdenum, compounds of tungsten and a mixture thereof by reaction with steam or oxygen or both in the gas phase in the presence of heated, agitated magnetic core particles to thereby obtain said carrier particles.
Claim 12
Dependent Claim
80 words
A process for the preparation of carrier particles for electrophotography consisting of a) a magnetic core and b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof, consisting of decomposing a volatile metal compound selected from the group consisting of compounds of molybdenum, compounds of tungsten and a mixture thereof by reaction with steam or oxygen or both in the gas phase in the presence of heated, agitated magnetic core particles to thereby obtain said carrier particles.
Claim 13
Dependent Claim
18 words
A process as claimed in claim 9, wherein the volatile metal compounds are metal halides or metal carbonyls.
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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) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |