US3898424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant fuser for xerographic reproducing apparatus
Assignee: Xerox Corp
•
Filing: 1974-02-25
•
Granted: 1975-08-05
•
Expires: 1994-02-25
Abstract
Abstract Apparatus for heat fixing toner images electrostatically adhered to copy paper. The apparatus is characterized by the provision of plural radiant energy sources capable of fusing low density as well as high density images in an efficient manner. In order to prevent physical contact of the radiant energy sources by the copy paper, a shield is provided which is transparent to energy in the wave length bands required for fusing high and low density images.
Inventors
- 👤 Raghulinga R Thettu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
Apparatus for heat fusing toner images to a substrate on which they are supported, said apparatus comprising: a first source of radiant energy capable of emitting energy having wave lengths on the order of 0.5-2.0 microns; a second source of radiant energy capable of emitting energy having wave lengths over 2.0 microns; means for transporting said substrate past said sources of radiant energy such that said toner images are directly exposed to said radiant sources; means interposed between said radiant sources and said substrate, said interposed means being substantially transparent to the energy emitted from both of said energy sources; said first source comprising a quartz lamp and said second source comprising a resistance heating element having an operating temperature substantially less than said first source; and expansible means for mounting said means interposed between said radiant sources and said substrate in a substantially planar orientation regardless of the temperature thereof.
Claim 2
Dependent Claim
151 words
Apparatus for heat fusing toner images to a substrate on which they are supported, said apparatus comprising: a first source of radiant energy capable of emitting energy having wave lengths on the order of 0.5-2.0 microns; a second source of radiant energy capable of emitting energy having wave lengths over 2.0 microns; means for transporting said substrate past said sources of radiant energy such that said toner images are directly exposed to said radiant sources; means interposed between said radiant sources and said substrate, said interposed means being substantially transparent to the energy emitted from both of said energy sources; said first source comprising a quartz lamp and said second source comprising a resistance heating element having an operating temperature substantially less than said first source; and expansible means for mounting said means interposed between said radiant sources and said substrate in a substantially planar orientation regardless of the temperature thereof.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1, wherein said expansible means is supported by depending flanges of reflector means associated with said energy sources.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 1, wherein said means interposed between said radiant sources and said substrate comprises a shield of polyimide film approximately 5 mils thick.
Claim 5
Dependent Claim
29 words
Apparatus according to claim 1, wherein said means interposed between said radiant sources and said substrate comprises a shield of polytetrafluoroethylene film on the order 5 mils in thickness.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |