US4825249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning blade for use with photoelectronic copying machine
Assignee: NTN Engineering Plastics Corp
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Filing: 1988-01-04
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Granted: 1989-04-25
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Expires: 2008-01-04
Abstract
Abstract An improved cleaning blade for a photoelectronic copying machine. It has a sharp, resilient edge and is superior in wear resistance, and lubricating and cleaning properties. The substrate of the cleaning blade is urethane rubber and is coated with perfluoropolyether having a main structural unit represented by --C x F 2x --O-- (x is 1, 2, 3 or 4) and having an isocyanate, hydroxyl, carboxyl or amino group at least at one end thereof. It may be coated with a mixture of the perfluoropolyether and an isocyanate group or a hydroxyl group.
Inventors
- 👤 Yoshio Oki
- 👤 Takeo Akatsuka
- 👤 Fuminori Satoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:12
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0011; G03G21/0017; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J2375/00; C08J2375/04; C08J2471/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with perfluoropolyether having a main structural unit represented by formula --C X F 2X --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof.
Claim 2
Dependent Claim
60 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with perfluoropolyether having a main structural unit represented by formula --C X F 2X --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof.
Claim 3
Dependent Claim
67 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with a mixture of perfluoropolyether having a main structural unit represented by formula --C x F 2x --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof, and an isocyanate compound.
Claim 4
Dependent Claim
67 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with a mixture of perfluoropolyether having a main structural unit represented by formula --C x F 2x --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof, and an isocyanate compound.
Claim 5
Dependent Claim
67 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with a mixture of perfluoropolyether having a main structural unit represented by formula --C x F 2x --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof, and a hydroxyl compound.
Claim 6
Dependent Claim
67 words
A cleaning blade for use with a photoelectronic copying machine, comprising a substrate of urethane rubber coated with a mixture of perfluoropolyether having a main structural unit represented by formula --C x F 2x --O--(x is 1, 2, 3 or 4) and having a group selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino groups at least at one end thereof, and a hydroxyl compound.
References Cited (Backward Citations)
US4218131A
Cited
US4083633A
Cited
US4247196A
Cited
US4284345A
Cited
US4469434A
Cited
US4417365A
Cited
US4639123A
Cited
US4537130A
Cited
US4630328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |