Patent EP0246013A2 successfully refreshed from Google Patents.
Patent EP0742658A2 successfully refreshed from Google Patents.
US4028255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymer composites
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1975-10-06
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Granted: 1977-06-07
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Expires: 1995-10-06
Abstract
Abstract A method for the preparation of composite particles having a specified range of particle size and comprising a finely divided, magnetic, particulate material embedded in a matrix of a linear polymeric material, which method comprises the steps of: A. forming discrete liquid droplets consisting of or containing the polymer, together with the particulate material; B. causing or allowing the droplets to form into solid particles; C. separating from the thus-formed particles those of the desired size range; D. re-converting the remaining particles to liquid form; and E. returning the re-liquified particles to step (a).
Inventors
- 👤 Brian Alfred Bolto
- 👤 Robert James Eldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:44
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28026; B01J20/28002; B01J20/28004; B01J20/28009; B01J20/2803; C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
Filter aid comprising composite particles having an average size of particle in the range from 5 to 10 μm with at least 90% w/w of the particles having a size within 10 μm of the average size and from 75% to 85% w/w of each particle comprising a magnetic particulate material of size less than 5 μm embedded in a matrix of a thermoplastic linear polymeric material.
Claim 2
Dependent Claim
67 words
Filter aid comprising composite particles having an average size of particle in the range from 5 to 10 μm with at least 90% w/w of the particles having a size within 10 μm of the average size and from 75% to 85% w/w of each particle comprising a magnetic particulate material of size less than 5 μm embedded in a matrix of a thermoplastic linear polymeric material.
References Cited (Backward Citations)
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |