Patent US5157446A successfully refreshed from Google Patents.
US5157446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus with a film having high and low electrical resistance layers
Assignee: Canon Inc
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Filing: 1991-12-20
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Granted: 1992-10-20
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Expires: 2011-12-20
Abstract
Abstract A heating apparatus includes a heater generating heat upon electric power supply thereto; a film, wherein an image on a recording material is heated by heat from the heater through the film; wherein the film comprises a high resistance layer at a side remote from the recording material and a low resistance layer at a side remote from the heater; and wherein an area of the high resistance layer is larger than an area of the low resistance layer.
Inventors
- 👤 Kensaku Kusaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
A heating apparatus, comprising: a heater generating heat upon electric power supply thereto; a film, wherein an image on a recording material is heated by heat from said heater through said film; wherein said film comprises a high electrical resistance layer at a side remote from the recording material and a low electrical resistance layer at a side remote from said heater; and wherein an area of said high resistance layer is larger than an area of said low resistance layer.
Claim 2
Dependent Claim
81 words
A heating apparatus, comprising: a heater generating heat upon electric power supply thereto; a film, wherein an image on a recording material is heated by heat from said heater through said film; wherein said film comprises a high electrical resistance layer at a side remote from the recording material and a low electrical resistance layer at a side remote from said heater; and wherein an area of said high resistance layer is larger than an area of said low resistance layer.
Claim 3
Dependent Claim
19 words
An apparatus according to claim 1, wherein said film is contactable to said heater and to the recording material.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 1, wherein a volume resistivity of said low resistance layer is not more than 10 11 ohm.cm.
Claim 5
Dependent Claim
19 words
An apparatus according to claim 1, wherein said low resistance layer is of fluorine resin containing low resistance material
Claim 6
Dependent Claim
22 words
An apparatus according to claim 4, wherein the volume resistivity of said low resistance layer is not more than 10 10 ohm.cm.
Claim 7
Dependent Claim
23 words
An apparatus according to claim 1, wherein said low resistance layer is provided except for at least one lateral side of said film.
Claim 8
Dependent Claim
17 words
An apparatus according to claim 6, wherein said film is in the form of an endless belt.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 1, wherein said low resistance layer has a width larger than a maximum width of usable recording materials.
Claim 10
Dependent Claim
14 words
An apparatus according to claim 1, wherein said low resistance layer is electrically grounded.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 1, wherein a volume resistivity of said high resistance layer is not less than 10 12 ohm.cm.
Claim 12
Dependent Claim
14 words
An apparatus according to claim 1, wherein said high resistance layer is of polyimide.
Claim 13
Dependent Claim
16 words
An apparatus according to claim 1, wherein said apparatus heat-fixes an image on the recording material.
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |