US4556324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming films of constant thickness
Assignee: EIDP Inc
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Filing: 1984-05-01
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Granted: 1985-12-03
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Expires: 2004-05-01
Abstract
Abstract Counter-rotating intermeshing rotors are employed to generate films of viscous material to enhance processing. The rotors are configured that they trap viscous material in open-ended chambers defined by the rotor surfaces. As rotation proceeds the chambers decrease in volume and the material is expelled through the ends of the chambers as a film. Longitudinally adjacent rotors each have a different angular orientation about their centers of rotation to provide a sawtooth stepped helix to convey material longitudinally.
Inventors
- 👤 Daniel G. Tynan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:13
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/481; B01; B01F; B01F27/00; B01F27/60; B01F27/70; B01F27/701; B01F27/702; B01F27/73; B01F27/731; B29B7/488; B29B7/489; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/40; B29C48/402; B29C48/50; B29C48/505; B29C48/67; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
In an apparatus for processing fluid material that includes a housing having a plurality of cylindrical bores and a rotor in each of said bores intermeshed with each other, said rotors being counter-rotating at equal rotational speeds, the improvement of which comprises: each of said rotors having a peripheral surface configuration of radial curved portions followed by curves tangent to circles of constant diameter centered about points located on a prolate epicycloid, the radial portions of one rotor coacting with the prolate epicycloid related curved portion of the other rotor during rotation, to provide a constant clearance between the closest point of the rotors to each other and to form an open-ended chamber which diminishes in volume as rotation proceeds so that material in said chamber is expelled through said ends of said chamber as a film.
Claim 2
Dependent Claim
137 words
In an apparatus for processing fluid material that includes a housing having a plurality of cylindrical bores and a rotor in each of said bores intermeshed with each other, said rotors being counter-rotating at equal rotational speeds, the improvement of which comprises: each of said rotors having a peripheral surface configuration of radial curved portions followed by curves tangent to circles of constant diameter centered about points located on a prolate epicycloid, the radial portions of one rotor coacting with the prolate epicycloid related curved portion of the other rotor during rotation, to provide a constant clearance between the closest point of the rotors to each other and to form an open-ended chamber which diminishes in volume as rotation proceeds so that material in said chamber is expelled through said ends of said chamber as a film.
Claim 3
Dependent Claim
54 words
The apparatus as defined in claim 1, there being a plurality of rotors in each of said bores, adjacent rotors on each longitudinal rotational axis in said bores being arranged in a sawtooth stepped helix so that material is conveyed in a longitudinal direction as it is expelled through said ends as a film.
Claim 4
Independent Claim
63 words
The apparatus as defined in claims 1 or 2, each of said rotors having a lobe and a hub, said lobe extending outwardly toward the surface of the bore, said lobe having a recessed outer surface, said hub having a protrusion, said protrusion intermeshing with the recessed outer surface of an axially adjacent rotor during a portion of the rotation of said rotors.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |