Patent US5376773A successfully refreshed from Google Patents.
US5376773A
Expired / Lapsed
US
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Heater having heat generating resistors
Assignee: Canon Inc
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Filing: 1992-12-28
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Granted: 1994-12-27
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Expires: 2012-12-28
Abstract
Abstract A heater apparatus includes an electrically insulative base plate and a plurality of independent resistors, extending along a length of the base plate, for producing heat upon electric energization thereof. A temperature detecting element detects a temperature of the base plate, and a controller controls a supply of electric power to the plurality of independent resistors so that the temperature detected by the detecting element approaches a predetermined temperature. A selecting device selects at least one of the resistors to be energized to change a resultant resistance of the selected resistors in accordance with an output of the detecting element.
Inventors
- 👤 Kazunori Masuda
- 👤 Hiroshi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:38
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0227; H05B1/023; H05B1/0241; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/2053; H05B3/00; H05B3/20; H05B3/22; H05B3/26; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2035; H05B2203/00; H05B2203/002; H05B2203/003; H05B2203/005; H05B2203/011; H05B2203/013; H05B2203/017; H05B2203/037
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A heater apparatus comprising: an electrically insulative base plate; a plurality of independent resistors, extending along a length of said base plate, for producing heat upon electric energization thereof; a temperature detecting element for detecting a temperature of said plate; control means for controlling a supply of electric power to said plurality of independent resistors so that the temperature detected by said detecting element approaches a predetermined temperature; and selecting means for selecting at least one of said resistors to be energized and for changing a resultant resistance of the selected at least one resistor in accordance with an output of said detecting element.
Claim 2
Dependent Claim
104 words
A heater apparatus comprising: an electrically insulative base plate; a plurality of independent resistors, extending along a length of said base plate, for producing heat upon electric energization thereof; a temperature detecting element for detecting a temperature of said plate; control means for controlling a supply of electric power to said plurality of independent resistors so that the temperature detected by said detecting element approaches a predetermined temperature; and selecting means for selecting at least one of said resistors to be energized and for changing a resultant resistance of the selected at least one resistor in accordance with an output of said detecting element.
Claim 3
Dependent Claim
19 words
An apparatus according to claim 1, wherein said plural resistors are extended substantially in parallel on said base plate.
Claim 4
Dependent Claim
14 words
An apparatus according to claim 1, wherein said resistors are laminated one above another.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 1, wherein said resistors have different resistances per unit length.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 4, wherein each said resistor has a different cross-sectional area from the other resistors.
Claim 7
Dependent Claim
18 words
An apparatus according to claim 5, wherein each said resistor has a different width from the other resistor.
Claim 8
Dependent Claim
18 words
An apparatus according to claim 5, wherein each said resistor has a different thickness from the other resistors.
Claim 9
Dependent Claim
26 words
An apparatus according to claim 1, wherein said selecting means includes a switch which is on-off-controlled with a unit of half wave of a power source.
Claim 10
Dependent Claim
50 words
An apparatus according to claim 1, wherein said control means includes zero-cross detecting means for detecting a zero-cross point of a wave form of electric power for the energization, and a switch for selecting said resistors to be energized, wherein said switch operates at any phase of the wave form.
Claim 11
Dependent Claim
46 words
An apparatus according to claim 1, wherein said resistors are provided independently from each other, wherein said apparatus further comprises a common electrode commonly connected to said resistors at one end of each said resistor, and electrodes connected to respective other ends of each said resistor.
Claim 12
Dependent Claim
61 words
A heater apparatus comprising: an electrically insulative and thermally conductive base plate; a plurality of independent resistors, extending along a length of one side of said base plate, for producing heat upon electric energization thereof; and temperature detecting elements corresponding to said resistors, respectively, wherein said detecting elements are disposed substantially opposite from said resistors, respectively, with said base plate therebetween.
Claim 13
Dependent Claim
61 words
A heater apparatus comprising: an electrically insulative and thermally conductive base plate; a plurality of independent resistors, extending along a length of one side of said base plate, for producing heat upon electric energization thereof; and temperature detecting elements corresponding to said resistors, respectively, wherein said detecting elements are disposed substantially opposite from said resistors, respectively, with said base plate therebetween.
Claim 14
Dependent Claim
55 words
An apparatus according to claim 11, wherein said resistors are independent from each other, wherein said apparatus further comprises a common electrode commonly connected to one end of each said resistor, and a plurality of electrodes, wherein respective ones of said plurality of electrodes are connected to other ends of respective ones of said resistors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |