Patent US4595565A successfully refreshed from Google Patents.
US4595565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for mixing liquid reactants
Assignee: BP Chemicals Ltd
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Filing: 1984-08-29
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Granted: 1986-06-17
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Expires: 2004-08-29
Abstract
Abstract A mixing head suitable for mixing two or more liquids is provided. During the mixing process, the liquids are first contacted in a zone of small dimensions in which turbulent mixing occurs and are then discharged into a zone of larger dimensions in which laminar flow is established. The two zones are so designed that there is a single piston operating in both zones and discharging the mixed product. The mixing head can be used to mix a polyol and a polyisocyanate during the formation of polyurethanes.
Inventors
- 👤 Rudolf J. Tenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:33
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7663; Y; Y10; Y10S; Y10S521/00; Y10S521/917; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87652
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A mixing head for mixing two or more liquids, said mixing head comprising: a cylinder having two portions of different cross-sectional areas interconnected for liquid flow therebetween and having a delivery end, one of said portions having a smaller cross-sectional area than the other of said portions and defining a mixing zone and the other of said portions having a larger cross-sectional area and defining a discharge zone; nozzles, one for each of the liquids, connected to said one of said portions of said cylinder for supplying said liquids to said mixing zone; and a reciprocable piston mounted in said cylinder for reciprocation toward and away from said delivery end of said cylinder, said piston having a cross-section substantially equivalent to that of the combined mixing and discharge zones operable in both zones for the discharge of the mixed liquids whereby movement of said piston toward said delivery end causes removal of mixed said liquids from both portions of said cylinder.
Claim 2
Dependent Claim
161 words
A mixing head for mixing two or more liquids, said mixing head comprising: a cylinder having two portions of different cross-sectional areas interconnected for liquid flow therebetween and having a delivery end, one of said portions having a smaller cross-sectional area than the other of said portions and defining a mixing zone and the other of said portions having a larger cross-sectional area and defining a discharge zone; nozzles, one for each of the liquids, connected to said one of said portions of said cylinder for supplying said liquids to said mixing zone; and a reciprocable piston mounted in said cylinder for reciprocation toward and away from said delivery end of said cylinder, said piston having a cross-section substantially equivalent to that of the combined mixing and discharge zones operable in both zones for the discharge of the mixed liquids whereby movement of said piston toward said delivery end causes removal of mixed said liquids from both portions of said cylinder.
Claim 3
Dependent Claim
28 words
A mixing head as claimed in claim 1 wherein said one of said portions has a rectangular cross-section and said other of said portions has a circular cross-section.
Claim 4
Dependent Claim
16 words
A mixing head as claimed in claim 1 wherein both of said portions have non-circular cross-sections.
Claim 5
Dependent Claim
28 words
A mixing head as claimed in claim 1 wherein said one of said portions has a rectangular cross-section and said other of said portions has a triangular cross-section.
Claim 6
Dependent Claim
28 words
A mixing head as claimed in claim 1 wherein said one of said portions has a rectangular cross-section and said other of said portions has a rectangular cross-section.
Claim 7
Dependent Claim
106 words
A mixing head as claimed in claim 1 wherein said cylinder further comprises a third portion having a cross-sectional area smaller than said other of said portions and defining a further mixing zone, said third portion being disposed in circumferentially spaced relation to said one of said portions, wherein nozzles, one for each liquid to be mixed in said third portion, are connected to said third portion for supplying liquids to said third portion and wherein said piston has a cross-section substantially equivalent to that of the combination of all three of the portions of said cylinder operable to discharge mixed liquids from all three portions.
Claim 8
Dependent Claim
55 words
A mixing head as claimed in claim 1 further comprising a valve connected to each nozzle for controlling the flow of liquid through each nozzle and having an outlet extending to the exterior of said mixing head for permitting liquid to flow through said valve when the nozzle to which it is connected is obstructed.
Claim 9
Dependent Claim
22 words
A mixing head as claimed in claim 7 wherein said valve is adjustable for adjusting the flow of liquid through each nozzle.
Claim 10
Dependent Claim
43 words
A mixing head as claimed in claim 1 wherein the nozzles connected to a portion of said cylinder having a smaller cross-sectional area are disposed at positions spaced with respect to each other in the direction of the longitudinal axis of said cylinder.
References Cited (Backward Citations)
US4260266A
Cited
US4418041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |