Patent US4886368A successfully refreshed from Google Patents.
US4886368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary mixer
Assignee: RA INDUSTRIES Inc
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Filing: 1987-08-13
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Granted: 1989-12-12
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Expires: 2007-08-13
Abstract
Abstract A mixing device for the mixing of two or more liquids. A shell body is configured with a cavity having a longitudinal axis and circular cross-section which rotatably houses a shaft. The shaft is configured along a portion of its surface with grooves for receiving liquids to be mixed from inlets located within the shell body. A narrow annular gap region is formed between the outer surface of the shaft and the inner surface of the internal cavity in that portion of the shaft containing the slotted grooves.
Inventors
- 👤 L. Tony King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:43
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4315; B01F25/43151; B01F27/00; B01F27/27; B01F27/272; B01F27/2722; B01F33/00; B01F33/80; B01F33/82; B01F33/822; B01F2025/91; B01F2025/911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A mixing device for the mixing of two or more liquids comprising a shell body having upstream and downstream ends and an internal cavity, said cavity having a longitudinal axis and substantially circular cross section, a shaft rotatably housed within said shell body and having a longitudinal axis which coincides with said longitudinal axis of said internal cavity, said shaft having slotted grooves configured along a portion of its surface for receiving the liquids to be mixed from inlets located within the shell body, a narrow annular gap region formed between the outer surface of the shaft and the inner surface of the internal cavity in the portion of the shaft containing said slotted grooves such that said liquids tend to smear in said narrow angular gap region, a drive shaft for connection to a suitable device for rotating said shaft within said internal cavity and inlet means located within said shell body for the introduction of two or more liquids to be mixed proximate the upstream end of said shell body and a liquid exit means located proximate the downstream end of said shell body for removing said two or more liquids.
Claim 2
Dependent Claim
193 words
A mixing device for the mixing of two or more liquids comprising a shell body having upstream and downstream ends and an internal cavity, said cavity having a longitudinal axis and substantially circular cross section, a shaft rotatably housed within said shell body and having a longitudinal axis which coincides with said longitudinal axis of said internal cavity, said shaft having slotted grooves configured along a portion of its surface for receiving the liquids to be mixed from inlets located within the shell body, a narrow annular gap region formed between the outer surface of the shaft and the inner surface of the internal cavity in the portion of the shaft containing said slotted grooves such that said liquids tend to smear in said narrow angular gap region, a drive shaft for connection to a suitable device for rotating said shaft within said internal cavity and inlet means located within said shell body for the introduction of two or more liquids to be mixed proximate the upstream end of said shell body and a liquid exit means located proximate the downstream end of said shell body for removing said two or more liquids.
Claim 3
Dependent Claim
40 words
The mixing device of claim 1 wherein said shaft is provided with a region of reduced cross section located upstream of said narrow annular gap region, said region of reduced cross section forming an upstream volume within said internal cavity.
Claim 4
Dependent Claim
21 words
The mixing device of claim 2 wherein a first liquid inlet is located within said shell body at said upstream volume.
Claim 5
Dependent Claim
23 words
The mixing device of claim 2 wherein a second liquid inlet is located within said shell body at said narrow annular gap region.
Claim 6
Dependent Claim
44 words
The mixing device of claim 2 wherein an impeller is located on said shaft within said upstream volume to increase hydraulic pressure on the liquids to be mixed causing the liquids to travel down said grooves towards the downstream end of said shell body.
Claim 7
Dependent Claim
40 words
The mixing device of claim 1 wherein said shaft is provided with a region of reduced cross section located downstream of said narrow annular gap region, said region of reduced cross section forming a downstream volume within said internal cavity.
Claim 8
Dependent Claim
22 words
The mixing device of claim 6 wherein said liquid exit means comprises an orifice in said shell body at said downstream volume.
Claim 9
Dependent Claim
62 words
The mixing device of claim 6 which further comprises a substantially circular plate located within said downstream volume having a geometric center which substantially coincides with the longitudinal axis of said shaft having openings formed therein for the passage of said two or more liquids to be mixed prior to the passage of said two or more liquids through said liquid exit.
Claim 10
Dependent Claim
36 words
The mixing device of claim 1 wherein the clearance between the outer surface of the shaft and the inner surface of the internal cavity forming the narrow angular gap region is approximately five-one-thousandths of an inch.
References Cited (Backward Citations)
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Cited
US1924080A
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US3064307A
Cited
US3164377A
Cited
GB998329A
Cited
US3321283A
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FR1532742A
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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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |