Patent US3794300A successfully refreshed from Google Patents.
US3794300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular spiral isg
Assignee: Badische Corp
•
Filing: 1971-12-30
•
Granted: 1974-02-26
•
Expires: 1991-12-30
Abstract
Abstract A device for generating internal surfaces within a flowing mass in a tube wherein the tube contains mixer elements adapted to mix a plurality of discrete fluids; and wherein the mixer elements are mounted on a shaft which shaft extends along the direction of flow within the tube. The mixer elements have a pitch to length ratio of about 1. In a preferred form, the mixer elements are formed from twisted involute elements of equal length mounted on the same length of the inner shaft.
Inventors
- 👤 R Harder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:39
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/434
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a stationary mixer having no movable parts comprising a hollow cylindrical tube and at least one mixer element therein; the improvement which comprises a spirally twisted sheet-like mixer element placed in the tube wherein said mixer element consists of two separate spirally twisted sheet-like units mounted on a shaft wherein the combined width of said units is equal to the diameter of the tube and the combined length is about equal to the pitch of the mixing element and the edges of said element extend to the tube walls throughout the length of the element, said element being mounted on a shaft which extends longitudinally through the tube, and said element having a pitch to length ratio of about 1.
Claim 2
Dependent Claim
121 words
In a stationary mixer having no movable parts comprising a hollow cylindrical tube and at least one mixer element therein; the improvement which comprises a spirally twisted sheet-like mixer element placed in the tube wherein said mixer element consists of two separate spirally twisted sheet-like units mounted on a shaft wherein the combined width of said units is equal to the diameter of the tube and the combined length is about equal to the pitch of the mixing element and the edges of said element extend to the tube walls throughout the length of the element, said element being mounted on a shaft which extends longitudinally through the tube, and said element having a pitch to length ratio of about 1.
Claim 3
Dependent Claim
81 words
A stationary mixer having no movable parts comprising a hollow cylindrical tube and a plurality of mixer elements longitudinally mounted in abutting relatIonship therein, each of said mixer elements comprising a spirally twisted sheet-like mixer element placed in the tube, the edges of said elements extending to the tube walls throughout the length of the elements, said elements being mounted on a shaft which extends longitudinally through the tube, and said elements having a pitch to length ratio of about 1.
Claim 4
Dependent Claim
81 words
A stationary mixer having no movable parts comprising a hollow cylindrical tube and a plurality of mixer elements longitudinally mounted in abutting relatIonship therein, each of said mixer elements comprising a spirally twisted sheet-like mixer element placed in the tube, the edges of said elements extending to the tube walls throughout the length of the elements, said elements being mounted on a shaft which extends longitudinally through the tube, and said elements having a pitch to length ratio of about 1.
Claim 5
Dependent Claim
111 words
A stationary mixer having no movable parts comprising a hollow cylindrical tube and a plurality of mixer elements longitudinally mounted therein each of said mixer elements comprising a spirally twisted sheet-like mixer element placed in the tube, the edges of said elements extending to the tube walls throughout the length of the elements, said elements being mounted on a shaft which extends longitudinally through the tube, and said elements having a pitch to length ratio of about 1, wherein the leading edge of each element is positioned at an angle of rotation around the mounting shaft of from 20* to 160* with respect to the leading edge of the preceding element.
Claim 6
Dependent Claim
111 words
A stationary mixer having no movable parts comprising a hollow cylindrical tube and a plurality of mixer elements longitudinally mounted therein each of said mixer elements comprising a spirally twisted sheet-like mixer element placed in the tube, the edges of said elements extending to the tube walls throughout the length of the elements, said elements being mounted on a shaft which extends longitudinally through the tube, and said elements having a pitch to length ratio of about 1, wherein the leading edge of each element is positioned at an angle of rotation around the mounting shaft of from 20* to 160* with respect to the leading edge of the preceding element.
Claim 7
Dependent Claim
17 words
The mixer of claim 1 wherein a plurality of mixer elements are longitudinally mounted in said tube.
Claim 8
Dependent Claim
12 words
The mixer of claim 1 wherein the shaft is a closed shaft.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |