US4489671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating apparatus
Assignee: Polaroid Corp
•
Filing: 1983-05-25
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Granted: 1984-12-25
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Expires: 2003-05-25
Abstract
Abstract Coating apparatus for slide, extrusion or curtain coating of one or more liquids on a moving web in which the metering orifice for each fluid to be coated is filled with a porous plug.
Inventors
- 👤 Edward J. Choinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/74; B; B05; B05C; B05C5/00; B05C5/007; B05C5/02; B05C5/0254; B05C9/00; B05C9/06; G03C2001/7433; G03C2001/7459
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A multilayer coater, comprising a plurality of elongated applicator plates, means mounting said plates in spaced relation to form a plurality of converging flow channels elongated in a direction normal to the direction in which said channels are converging, and an elongated porous element mounted at the convergent ends of said channels and blocking said convergent ends, whereby fluid compositions supplied to said channels under pressure will flow through said element while experiencing pressure drops that are large compared to the cross stream pressure drops in said channels.
Claim 2
Dependent Claim
88 words
A multilayer coater, comprising a plurality of elongated applicator plates, means mounting said plates in spaced relation to form a plurality of converging flow channels elongated in a direction normal to the direction in which said channels are converging, and an elongated porous element mounted at the convergent ends of said channels and blocking said convergent ends, whereby fluid compositions supplied to said channels under pressure will flow through said element while experiencing pressure drops that are large compared to the cross stream pressure drops in said channels.
Claim 3
Dependent Claim
22 words
The coater of claim 1, in which the sizes of the pores in said porous element are between 25 and 250 microns.
Claim 4
Dependent Claim
51 words
A multilayer coater, comprising a plurality of contiguous elongated wedge shaped porous elements separated by liquid-impermeable membranes and forming converging porous channels for conveying liquid coating compositions to a common multilayer bead for entrainment on a web moving adjacent said bead, said channel being spaced from the web by a gap.
Claim 5
Dependent Claim
51 words
A multilayer coater, comprising a plurality of contiguous elongated wedge shaped porous elements separated by liquid-impermeable membranes and forming converging porous channels for conveying liquid coating compositions to a common multilayer bead for entrainment on a web moving adjacent said bead, said channel being spaced from the web by a gap.
Claim 6
Dependent Claim
22 words
The coater of claim 3, in which the sizes of the pores in said porous elements are between 25 and 250 microns.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |