Patent US3617029A successfully refreshed from Google Patents.
US3617029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the production of foam plastics materials in particular polyurethane foams
Assignee: Bayer AG
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Filing: 1969-02-13
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Granted: 1971-11-02
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Expires: 1989-02-13
Abstract
Abstract In the production of foam plastic, changes in the specific volume of the materials mixed together for the reaction which forms the foam, may adversely affect the quality of the product. To compensate for such changes, the feed conduits conveying the materials to the mixing chamber are interconnected by a conduit in which a distensible member sealing the feed conduits from each other, is mounted.
Inventors
- 👤 Karl Breer
- 👤 Claus Nadolski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:18
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/60; B29B7/603
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
Apparatus according to claim 1, and a piston slidably mounted in the connecting conduit abutting with the distensible membrane.
Claim 2
Dependent Claim
31 words
Apparatus according to claim 1, and a second disteNsible membrane as aforesaid, said membranes being in axially spaced relation in the conduit, and a fluid filling the conduit between said membranes.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |