US4977308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat roller type fixing device and method of producing the same
Assignee: Ricoh Co Ltd
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Filing: 1988-06-20
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Granted: 1990-12-11
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Expires: 2008-06-20
Abstract
Abstract A heat roller type fixing device having a fixing roller and a pressing roller and applicable to an electrophotographic copier or like image forming apparatus, and a method of producing the same. The pressing roller is produced such that the content of 3- to 15-mer, preferably 3- to 10-mer, low-molecular weight siloxanes (oligomers) which are contained in the roller is less than 300 parts per million. While the fixing device is in operation, chargers built in the image forming apparatus are prevented from being whitened by pologomers which are evaporated from the pressing roller.
Inventors
- 👤 Setsuo Soga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; C; C08; C08G; C08G77/00; C08G77/04; C08G77/32; C08G77/34; G03G15/206
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
In a heat roller type fixing device having a fixing roller and a pressing roller which is rotatable in pressing contact with said fixing roller and which is covered with silicone rubber, said device fixing a toner image to a toner carrier which is moved between said fixing roller and said pressing roller, the improvement which comprises; said silicone rubber having a 3- to 15-mer low molecular weight siloxane content of less than 300 parts per million.
Claim 2
Dependent Claim
77 words
In a heat roller type fixing device having a fixing roller and a pressing roller which is rotatable in pressing contact with said fixing roller and which is covered with silicone rubber, said device fixing a toner image to a toner carrier which is moved between said fixing roller and said pressing roller, the improvement which comprises; said silicone rubber having a 3- to 15-mer low molecular weight siloxane content of less than 300 parts per million.
Claim 3
Dependent Claim
32 words
The heat roller type fixing device as claimed in claim 1, wherein said silicon rubber has a 3- to 10-mer low molecular weight siloxane content of less than 300 parts per million.
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) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |