US4859074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed mixing machine
Assignee: Kobe Steel Ltd
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Filing: 1987-08-06
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Granted: 1989-08-22
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Expires: 2007-08-06
Abstract
Abstract A closed mixing machine includes a pair of nonintermeshed rotors rotatable in chambers at a predetermined differential rotation ratio and having respective rotor tips set at a predetermined differential phase angle. The predetermined differential rotation ratio is set to be 1.0 and the predetermined differential phase angle is set to be 0 to 45 degrees so that the mixing machine performs improved macro-dispersion.
Inventors
- 👤 Toshihiro Asai
- 👤 Katsunobu Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:10
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/02; B29B7/06; B29B7/10; B29B7/18; B29B7/183; B29B7/186; B29B7/74; B29B7/7476; B29B7/7495
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A closed mixing machine, comprising: a casing defining therein a pair of chambers provided with end frames closing said chambers at end portions thereof; and a pair of non-intermeshed rotors mounted on parallel axes disposed within the chambers and adapted to rotate in opposite directions; each said rotor having tips which extend along the length of said rotor and on substantially opposite sides of said rotor, said rotors having a differential rotation ratio of 1.0, said rotor tips being set in position so that a differential phase angle of the rotor tips at an axially central portion thereof of 0±up to 45 degrees is obtained.
Claim 2
Dependent Claim
105 words
A closed mixing machine, comprising: a casing defining therein a pair of chambers provided with end frames closing said chambers at end portions thereof; and a pair of non-intermeshed rotors mounted on parallel axes disposed within the chambers and adapted to rotate in opposite directions; each said rotor having tips which extend along the length of said rotor and on substantially opposite sides of said rotor, said rotors having a differential rotation ratio of 1.0, said rotor tips being set in position so that a differential phase angle of the rotor tips at an axially central portion thereof of 0±up to 45 degrees is obtained.
Claim 3
Dependent Claim
63 words
A closed mixing machine according to claim 1, wherein the rotor has a vane of a predetermined length and a rotor helix angle and wherein a rotor length/chamber diameter ratio of 1.2 to 2.2, a rotor inclusion angle is 15 to 35 degrees, a ratio of rotor vane length is 0.1 to 0.48, and said rotor helix angle is 20 to 45 degrees.
Claim 4
Dependent Claim
64 words
A closed mixing machine according to claim 1, wherein the rotor has a vane of a predetermined length and a rotor helix angle and wherein a rotor length/chamber diameter ratio is 1.2 to 2.2, a rotor inclusion angle θ is 15 to 35 degrees, a ratio of rotor vane length is 0.1 to 0.48, and said rotor helix angle is 0 to 45 degrees.
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |