Patent US4565762A successfully refreshed from Google Patents.
US4565762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Applicator for releasing agent
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-09-12
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Granted: 1986-01-21
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Expires: 2004-09-12
Abstract
Abstract An apparatus and a method for applying a releasing agent to a fixation roller so that toners are not undesirably built up on the rollers and unwanted spots on a document being reproduced are avoided. The releasing agent includes a polypropylene powder dispersed in silicone oil wherein the powder and oil are heated to raise the powder to a molten state and the powder and oil are then cooled forming fine particles of polypropylene powder that do not tend to float on the top of the silicone oil.
Inventors
- 👤 Chiaki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
An applicator for applying a releasing agent to a heated fixation roller, said applicator comprising: a releasing agent including polypropylene powder dispersed in silicone oil which is heated to bring the polypropylene to a molten state; holding means for holding said releasing agent; and a porous resin material for transferring said releasing agent from said holding means to the fixation roller.
Claim 2
Dependent Claim
61 words
An applicator for applying a releasing agent to a heated fixation roller, said applicator comprising: a releasing agent including polypropylene powder dispersed in silicone oil which is heated to bring the polypropylene to a molten state; holding means for holding said releasing agent; and a porous resin material for transferring said releasing agent from said holding means to the fixation roller.
Claim 3
Dependent Claim
61 words
An applicator for applying a releasing agent according to claim 1, wherein said releasing agent includes polypropylene powder dispersed in said silicone oil at room temperature and the polypropylene powder is brought to a molten state by heating the powder to a temperature above the melting point of said polypropylene powder, and then cooling the polypropylene to form fine powder particles.
Claim 4
Dependent Claim
42 words
An applicator for a releasing agent according to claim 1, wherein said porous resin material comprises tetraflouroethylene and has pores formed therein having diameters in the range of 1-10 μm and said porous material has a porosity in the range of 50-85%.
Claim 5
Independent Claim
77 words
A method of applying a releasing agent to a heated fixation roller comprising the steps of: (a) dispersing a polypropylene powder in silicone oil; (b) heating the dispersed polypropylene powder in the silicone oil to a temperature greater than the melting point of said polypropylene powder; (c) cooling said heated polypropylene powder to form a fine particle polypropylene powder; and (d) applying said fine particle polypropylene powder dispersed in said silicone oil to the heated fixation roller.
Claim 6
Independent Claim
77 words
A method of applying a releasing agent to a heated fixation roller comprising the steps of: (a) dispersing a polypropylene powder in silicone oil; (b) heating the dispersed polypropylene powder in the silicone oil to a temperature greater than the melting point of said polypropylene powder; (c) cooling said heated polypropylene powder to form a fine particle polypropylene powder; and (d) applying said fine particle polypropylene powder dispersed in said silicone oil to the heated fixation roller.
Claim 7
Dependent Claim
37 words
A method of applying a releasing agent according to claim 4, wherein step (d) includes applying said fine particle polypropylene powder dispersed in said silicone oil to the heated fixation roller via a tetraflouroethylene resin porous material.
Claim 8
Dependent Claim
23 words
A method of applying a releasing agent according to claim 5, wherein said polypropylene powder has molecular weight in the range of 3000-4000.
Claim 9
Dependent Claim
38 words
A method of applying a releasing agent according to claim 6, wherein the pores of said porous material have diameters in the range of 1-10 μm, and said porous material has a porosity in the range of 50-85%.
Claim 10
Dependent Claim
28 words
A method of applying a releasing agent according to claim 7, wherein said heated fixation roller is heated to a temperature in the range of 170° C.-200° C.
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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |