US3643874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of intermediates of polyaddition resins
Assignee: Buss AG
•
Filing: 1969-09-09
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Granted: 1972-02-22
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Expires: 1989-09-09
Abstract
Abstract Process for the preparation of polyaddition resins, including proportioning and feeding base compositions in a mixing and kneading machine, mixing them with simultaneous heating or cooling, in a solid and/or liquid state, plasticizing and homogenizing the compositions, expelling the resin mix through a heated die onto a cooling belt, solidifying and preforming the resin mix into loosely connected small pieces, and breaking up as well as grinding the preformed pieces of the resin mix. Optionally crushing may be performed before the breaking and grinding step.
Inventors
- 👤 Peter Franz
- 👤 Andreas Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:08
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
The process as defined in claim 1, further comprising the step of differently heating different zones of said mixing and kneading machine.
Claim 2
Dependent Claim
30 words
The process as defined in claim 1, further compRising the step of heating the moving parts of said mixing and kneading machine to a lower temperature than the stationary parts.
Claim 3
Dependent Claim
30 words
The process as defined in claim 1, further comprising the step of starting said mixing and kneading machine with slow speed which is continuously increased until full speed is reached.
Claim 4
Dependent Claim
26 words
The process as defined in claim 1, further comprising the step of crushing the solid and friable preformed resin mix before said breaking and grinding step.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |