Patent US4291991A successfully refreshed from Google Patents.
US4291991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of a reaction mixture from fluid components
Assignee: Bayer AG
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Filing: 1979-08-15
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Granted: 1981-09-29
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Expires: 1999-08-15
Abstract
Abstract The invention is directed to an apparatus for the preparation of a reaction mixture, from fluid components, comprising storage tanks, feed pipes leading from said storage tanks to a mixing head via metering pumps and opening into a mixing chamber via injection apertures, said mixing chamber formed by the bore of a housing, a control piston displaceable within said bore and being capable of blocking flow through said apertures, return lines branching off upstream of said apertures and leading up to said storage tanks, and a shut-off means for stopping the flow of said material through at least one of said return lines, the activation of said shut-off means being dependent upon the position of said control piston within said bore.
Inventors
- 👤 Klaus Schulte
- 👤 Heinrich Ersfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7663; B29B7/7404; B29B7/7615; B29B7/7631; B29B7/7684; B29B7/7689; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
Apparatus for the preparation of a reaction mixture, from fluid components, comprising storage tanks, feed pipes leading from said storage tanks to a mixing head via metering pumps and opening into a mixing chamber via injection apertures, said mixing chamber formed by the bore of a housing, a control piston displaceable within said bore and being capable of blocking flow through said apertures, return lines branching off upstream of said apertures and leading up to said storage tanks, and a shut-off means for stopping the flow of said material through at least one of said return lines, the activation of said shut-off means being dependent upon the position of said control piston within said bore.
Claim 2
Dependent Claim
115 words
Apparatus for the preparation of a reaction mixture, from fluid components, comprising storage tanks, feed pipes leading from said storage tanks to a mixing head via metering pumps and opening into a mixing chamber via injection apertures, said mixing chamber formed by the bore of a housing, a control piston displaceable within said bore and being capable of blocking flow through said apertures, return lines branching off upstream of said apertures and leading up to said storage tanks, and a shut-off means for stopping the flow of said material through at least one of said return lines, the activation of said shut-off means being dependent upon the position of said control piston within said bore.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1, characterized in that a shut-off means is provided in each return line.
Claim 4
Dependent Claim
54 words
The apparatus of claim 1, characterized in that said shut-off means is a rearward extension of the control piston, said rearward extension being provided with at least one channel, said channel being situated such that when said control piston blocks said apertures, said channel connects the inflowing and outflowing sections of the return lines.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3, characterized in that a seal is provided between the ranges of displacement of said channels.
Claim 6
Dependent Claim
60 words
The apparatus of claim 1, characterized in that said shut-off means, being provided with a control element, is arranged in at least one return line and in that said shut-off means consist of an electronic proximity switch which is activated by the position of control piston and which is connected to an impulse convertor which communicates with the control element.
Claim 7
Dependent Claim
22 words
The apparatus of claim 5, characterized in that a time delay element is arranged between the impulse convertor and the control element.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |