Patent US3911091A successfully refreshed from Google Patents.
US3911091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Milling trigonal selenium particles to improve xerographic performance
Assignee: Xerox Corp
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Filing: 1974-06-21
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Granted: 1975-10-07
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Expires: 1994-06-21
Abstract
Abstract A method of improving the photoconductive properties of trigonal selenium which comprises first providing a source of unmilled particulate trigonal selenium having an average particle size usually greater than about 1 micron. The particulate trigonal selenium is then milled to an average particle size of less than about 1 micron, whereby the selenium particles exhibit improved xerographic properties.
Inventors
- 👤 Ronald E Karam
- 👤 David J Swarthout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:44
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/02; B; B82; B82Y; B82Y30/00; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/085; C01P; C01P2004/00; C01P2004/20; C01P2004/22; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A METHOD OF IMPROVING THE PHOTOCONDUCTIVE PROPERTIES OF TRIGONAL SELENIUM WHICH COMPRISES PROVIDING A SOURCE OF UNMILLED PARTICULATE TRIGONAL SELENIUM PARTICLES, SAID METHOD COMPRISING MILLIMG SAID PARTICULATE TRIGONAL SELENIUM TO REDUCE THE ORIGINAL PARTICLE SIZE WHEREBY SAID PARTICLES EXHIBIT IMPROVED PHOTOSENSITIVITY.
Claim 2
Independent Claim
41 words
A METHOD OF IMPROVING THE PHOTOCONDUCTIVE PROPERTIES OF TRIGONAL SELENIUM WHICH COMPRISES PROVIDING A SOURCE OF UNMILLED PARTICULATE TRIGONAL SELENIUM PARTICLES, SAID METHOD COMPRISING MILLIMG SAID PARTICULATE TRIGONAL SELENIUM TO REDUCE THE ORIGINAL PARTICLE SIZE WHEREBY SAID PARTICLES EXHIBIT IMPROVED PHOTOSENSITIVITY.
Claim 3
Dependent Claim
9 words
The product formed by the process of claim 1.
Claim 4
Independent Claim
55 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium having an average particle size greater than about 1 micron, said method comprising milling said particulate trigonal selenium to an average particle size of less than about 1.0 micron, whereby said particles exhibit improved photosensitivity.
Claim 5
Independent Claim
55 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium having an average particle size greater than about 1 micron, said method comprising milling said particulate trigonal selenium to an average particle size of less than about 1.0 micron, whereby said particles exhibit improved photosensitivity.
Claim 6
Independent Claim
55 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium having an average particle size greater than about 1 micron, said method comprising milling said particulate trigonal selenium to an average particle size of about 0.2 microns or less whereby said particles exhibit improved photosensitivity.
Claim 7
Independent Claim
55 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium having an average particle size greater than about 1 micron, said method comprising milling said particulate trigonal selenium to an average particle size of about 0.2 microns or less whereby said particles exhibit improved photosensitivity.
Claim 8
Dependent Claim
9 words
The product formed by the process of claim 4.
Claim 9
Independent Claim
42 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium, said method comprising milling said particulate trigonal selenium without reducing the particle size of the particles whereby said particles exhibit improved photosensitivity.
Claim 10
Independent Claim
42 words
A method of improving the photoconductive properties of trigonal selenium which comprises providing a source of unmilled particulate trigonal selenium, said method comprising milling said particulate trigonal selenium without reducing the particle size of the particles whereby said particles exhibit improved photosensitivity.
Claim 11
Dependent Claim
9 words
The product formed by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |