Patent US946025A successfully refreshed from Google Patents.
US3953709A
Expired / Lapsed
US
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Two source radiant fuser for xerographic reproducing apparatus
Assignee: Xerox Corp
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Filing: 1974-02-25
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Granted: 1976-04-27
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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 high density images without scorching light weight paper and fusing low density images without fusing background toner particles. The energy source for fusing low density images comprises a low mass resistance heating element which radiates energy at wavelengths suitable for absorption by the paper in order to fuse low density toner images.
Inventors
- 👤 John F. Elter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
Radiant fuser for fixing toner images to copy substrates, said fuser comprising: a first radiant source of energy for fushing high density images without scorching said copy substrates; and a second source of radiant energy for fusing low density images without fusing background toner particles, said second source of radiant energy comprising a low mass member capable of rapid temperature increases and operating at a temperature of about 800°C.
Claim 2
Dependent Claim
69 words
Radiant fuser for fixing toner images to copy substrates, said fuser comprising: a first radiant source of energy for fushing high density images without scorching said copy substrates; and a second source of radiant energy for fusing low density images without fusing background toner particles, said second source of radiant energy comprising a low mass member capable of rapid temperature increases and operating at a temperature of about 800°C.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1, wherein said first source of radiant energy comprises a quartz lamp operating at a temperature of approximately 2400°K.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 1, wherein said second source of energy comprises means for absorbing energy from said first source of energy and reradiating said energy.
Claim 5
Dependent Claim
25 words
Apparatus according to claim 3, wherein said second source of energy is secured to a quartz window disposed intermediate said first and second radiant sources.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 1, wherein both of said energy sources are disposed on the same side of said copy substrate.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 1, wherein said energy sources are disposed on opposite sides of said copy substrate.
References Cited (Backward Citations)
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |