Patent US4408890A successfully refreshed from Google Patents.
US4408890A
Expired / Lapsed
US
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Pigment pre-blending mixhead attachment
Assignee: EIDP Inc
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Filing: 1981-03-11
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Granted: 1983-10-11
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Expires: 2001-03-11
Abstract
Abstract An attachment to a dynamic mixhead allows pigment to be fully blended with a specified volumetric portion of a reactive polymer mix immediately prior to its passing through an in-line motionless mixer. The fully pigmented portion of the mix passes into the motionless mixer concurrently with the nonpigmented remainder of the polymer mix, each portion constituting a discrete stream and positioned in a manner facilitating rapid, improved blending. The pigment pre-blending attachment possesses particular utility for partial or incomplete blending applications, wherein striations of color are desired to impart a marbled effect.
Inventors
- 👤 Charles H. Beckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:16
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/80; B29B7/88; B01; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/313; B01F25/3131; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4314; B01F27/00; B01F27/60; B01F27/70; B01F33/00; B01F33/80; B01F33/82; B01F33/822; B01F33/834; B01F23/00; B01F23/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A mixhead attachment for preparing a viscous fluid for marbled pigmentation, said attachment being adapted to convey said fluid from a mixhead to an in-line motionless mixer, said attachment comprising: a generally cylindrical housing having an inlet end adapted for attachment to said mixhead and an outlet end adapted for attachment to said motionless mixer; an open-ended, generally cylindrical tube coaxially positioned within said housing and radially separated therefrom, providing a first annular passage for the flow of a portion of said fluid; means for securing said tube within said housing; a mixing shaft rotatably mounted within said tube and radially separated therefrom, providing a second annular passage for the flow of the balance of said fluid; a plurality of fins mounted on said mixing shaft and partially extending into the second annular passage; means for rotating said mixing shaft; and means for allowing the introduction of pigment into said second annular passage wherein substantially complete pigmentation of said balance of said fluid occurs.
Claim 2
Dependent Claim
164 words
A mixhead attachment for preparing a viscous fluid for marbled pigmentation, said attachment being adapted to convey said fluid from a mixhead to an in-line motionless mixer, said attachment comprising: a generally cylindrical housing having an inlet end adapted for attachment to said mixhead and an outlet end adapted for attachment to said motionless mixer; an open-ended, generally cylindrical tube coaxially positioned within said housing and radially separated therefrom, providing a first annular passage for the flow of a portion of said fluid; means for securing said tube within said housing; a mixing shaft rotatably mounted within said tube and radially separated therefrom, providing a second annular passage for the flow of the balance of said fluid; a plurality of fins mounted on said mixing shaft and partially extending into the second annular passage; means for rotating said mixing shaft; and means for allowing the introduction of pigment into said second annular passage wherein substantially complete pigmentation of said balance of said fluid occurs.
Claim 3
Dependent Claim
20 words
The mixhead attachment of claim 1 wherein said generally cylindrical tube tapers inwardly in the direction of the fluid flow.
Claim 4
Dependent Claim
38 words
The mixhead attachment of claims 1 or 2 wherein said fins are arranged at an oblique angle to the direction of fluid flow in order to impart a pumping motion to said fluid as said mixing shaft rotates.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |