US3672644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for intensive mixers
Assignee: Monsanto Co
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Filing: 1969-12-05
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Granted: 1972-06-27
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Expires: 1989-12-05
Abstract
Abstract An improved rotor for use in intensive mixers which reduces leakage of material out of the mixers comprising a substantially cylindrical body having affixed thereto a pair of diagonally disposed spiral lobes, said lobes terminating at the respective ends of the rotor at oppositely opposed end plate sections, the distance between the edges of the lobes adjacent the end face plate sections and the internal wall of the mixing chamber being greater than the distance between the edges of the lobes farthest from the end face plate sections and the internal wall of the mixing chamber.
Inventors
- 👤 Arthur R Crixell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:28
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/02; B29B7/06; B29B7/10; B29B7/18; B29B7/183; B29B7/186
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
In an intensive mixer of the type having a stationary mixing chamber, said chamber having a substantially figure-eight-shaped cross-sectional area, mixing means rotatably mounted in each half of said chamber to impart mixing and shearing of material contained therein, the improvement whereby leakage of said material out of said chamber is substantially reduced wherein said mixing means comprises a substantially cylindrical rotor having a pair of substantially spiral lobes located diagonally from one another across the long axis of said rotor, said rotor having an end face plate section on each end abutting the ends of said chamber, the lobes terminating at said end face plate sections, the distance between the internal wall of said chamber and the edges of the lobes nearest the end face plate sections being greater than the distance between the internal wall of said chamber and the edges of the lobes located farthest from said end face plate sections, the distance between said internal wall of said chamber and the edges of said end face plate sections being substantially equal to the distance between said internal wall and said edges of said lobes located farthest from said end face plate sections.
Claim 2
Dependent Claim
196 words
In an intensive mixer of the type having a stationary mixing chamber, said chamber having a substantially figure-eight-shaped cross-sectional area, mixing means rotatably mounted in each half of said chamber to impart mixing and shearing of material contained therein, the improvement whereby leakage of said material out of said chamber is substantially reduced wherein said mixing means comprises a substantially cylindrical rotor having a pair of substantially spiral lobes located diagonally from one another across the long axis of said rotor, said rotor having an end face plate section on each end abutting the ends of said chamber, the lobes terminating at said end face plate sections, the distance between the internal wall of said chamber and the edges of the lobes nearest the end face plate sections being greater than the distance between the internal wall of said chamber and the edges of the lobes located farthest from said end face plate sections, the distance between said internal wall of said chamber and the edges of said end face plate sections being substantially equal to the distance between said internal wall and said edges of said lobes located farthest from said end face plate sections.
Claim 3
Dependent Claim
70 words
The rotor of claim 1 wherein each edge of said lobes has a notch adjacent said end plate section, said notch having a length of from 10 to 20 percent of the total length of the edge of the lobe, said notch having a depth of at least 2 percent of the perpendicular distance from the edge of the lobe to the center of the cylindrical portion of said rotor.
Claim 4
Dependent Claim
58 words
The rotor of claim 1 wherein said lobes are continuously tapered, the distance between said internal wall of said chamber and the edges of said lobe nearest said end face plate sections being greater than the distance between the internal wall of said chamber and said edges of said lobes located farthest from said end plate face sections.
Claim 5
Dependent Claim
11 words
The rotor of claim 3 wherein said lobes are uniformly tapered.
Claim 6
Dependent Claim
56 words
The rotor of claim 3 wherein said distance between said internal wall of said chamber and said edges of said lobes located nearest said end face plate sections is substantially equal to the perpendicular distance from the edges of said lobes located farthest from said end face plate sections to the cylindrical surface of said rotor.
Claim 7
Dependent Claim
12 words
The rotor of claim 1 wherein said lobes of are different length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |