US4024834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated doctor blade
Assignee: Xerox Corp
•
Filing: 1975-08-11
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Granted: 1977-05-24
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Expires: 1995-08-11
Abstract
Abstract A temperature compensated doctor blade system is disclosed for controlling the amount of liquid on a substrate. Variation in temperature is found to cause wide variation in liquid viscosity which affects doctor blade pressure requirements. An expandable chamber containing a temperature responsive fluid is used to control the pressure applied to a flexible doctor blade.
Inventors
- 👤 Robert Albert Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:15
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/34; D21H23/52; D21H23/56; D21H23/58; D21H23/60; D21H5/00; D21H5/0005; D21H5/0025; D21H5/003; D21H5/0032; D21H5/0035; G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101; G03G15/102
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
Apparatus in which a blade is urged against a surface for controlling the amount of liquid on said surface, comprising temperature compensating means adapted to increase pressure at increased operating temperatures and decrease pressure at decreased operating temperatures which comprise a fixed sealed expandable chamber containing a temperature responsive fluid and linking means responsive to said increased pressure and said decreased pressure of said expandable chamber for urging said blade into contact with said surface.
Claim 2
Dependent Claim
75 words
Apparatus in which a blade is urged against a surface for controlling the amount of liquid on said surface, comprising temperature compensating means adapted to increase pressure at increased operating temperatures and decrease pressure at decreased operating temperatures which comprise a fixed sealed expandable chamber containing a temperature responsive fluid and linking means responsive to said increased pressure and said decreased pressure of said expandable chamber for urging said blade into contact with said surface.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1 wherein said expandable chamber is in a container and said means responsive to the expansion and contraction of said chamber includes a piston moveably mounted in said container.
Claim 4
Dependent Claim
32 words
The apparatus of claim 1 wherein said means responsive to the expansion and contraction of said chamber includes means to provide a non-linear relationship between fluid volume change and doctor blade pressure.
Claim 5
Dependent Claim
17 words
The apparatus of claim 1 wherein said blade is relatively flexible and said surface is relatively inflexible.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1 wherein said surface is defined by the periphery of a roll.
Claim 7
Dependent Claim
19 words
The apparatus of claim 5, wherein said roll has a peripheral surface comprising a pattern of lands and valleys.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |