US3753554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making polyurethanes
Assignee: BASF Corp
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Filing: 1971-08-31
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Granted: 1973-08-21
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Expires: 1991-08-31
Abstract
Abstract An apparatus and process are provided for making a series of batches of foamable polyurethane reaction mixture wherein flushing of the apparatus between each batch is with one of the components used to prepare the reaction mixture.
Inventors
- 👤 G Muller
- 👤 H Raffenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/7433; B01; B01F; B01F35/00; B01F35/10; B01F35/145; B01F35/1452; B01F35/56
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The apparatus of claim 1 wherein the said containers are suspended on a means for continuously weighing them and their contents.
Claim 2
Dependent Claim
13 words
The apparatus of claim 2 wherein the weighing means is a spring balance.
Claim 3
Independent Claim
91 words
An apparatus for making a polyurethane foam which comprises at least two containers for chemically reactive components which when mixed together form a foamable polyurethane reaction mixture and a mixer adapted to mixing components together and discharge the resulting mixture therefrom, each container having bottom sloping towards a discharge opening in that portion thereof overlapping the underlying mixer, means for opening and closing the opening, means for transferring measured amounts of component from each container to the mixer, and means for transferring liquid from the mixer to at least one container.
Claim 4
Dependent Claim
15 words
The apparatus of claim 4 comprising pneumatic means for opening and closing the discharge opening.
Claim 5
Independent Claim
105 words
An apparatus for making a polyurethane foam which comprises at least two containers for chemically reactive components which when mixed together form a foamable polyurethane reaction mixture and a mixer adapted to mixing components together and discharge the resulting mixture therefrom, the said containers being disposed side by side and above the mixer with the maximum possible cross-section of each container overlapping the mixer, the containers being mounted on means for continuously weighing them, means for transferring measured amounts of component from each container to the mixer and the means for transferring liquid from the mixer to at least one container is a suction tube.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |