Patent US4233365A successfully refreshed from Google Patents.
US4233365A
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Free flowing particles of elastomeric material and method
Assignee: DSM Copolymer Inc
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Filing: 1979-04-06
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Granted: 1980-11-11
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Expires: 1999-04-06
Abstract
Abstract Elastomeric particles which are rendered free flowing by treatment with the combination of a finely divided partitioning agent and a fibrilatable polymer which has been fibrilated to form a network on the surface of the elastomeric material with retention of the partitioning agent thereby.
Inventors
- 👤 Rudolph F. Karg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08J2321/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
Free flowing particles of elastomeric material comprising particles of elastomeric material, a porous network of fibrilated synthetic resinous material on the surface of the elastomeric particle, and finely divided solid particles of partitioning agent entrapped for retention by the fibrilated synthetic resinous network to maintain separation for free flow of the elastomeric particles.
Claim 2
Dependent Claim
53 words
Free flowing particles of elastomeric material comprising particles of elastomeric material, a porous network of fibrilated synthetic resinous material on the surface of the elastomeric particle, and finely divided solid particles of partitioning agent entrapped for retention by the fibrilated synthetic resinous network to maintain separation for free flow of the elastomeric particles.
Claim 3
Dependent Claim
22 words
Free flowing particles of elastomeric material as claimed in claim 1, in which the fibrilated synthetic resinous material is a polytetrafluoroethylene resin.
Claim 4
Dependent Claim
36 words
Free flowing particles of elastomeric material as claimed in claim 1, in which the fibrilated synthetic resinous material is present in an amount within the range of 0.01 to 1% by weight of the elastomeric material.
Claim 5
Dependent Claim
33 words
Free flowing particles of elastomeric material as claimed in claim 2, in which the polytetrafluoroethylene is present in an amount within the range of 0.03 to 0.06% by weight of the elastomeric material.
Claim 6
Dependent Claim
21 words
Free flowing particles of elastomeric material as claimed in claim 1, in which the partitioning agent is a synthetic calcium silicate.
Claim 7
Dependent Claim
34 words
Free flowing particles of elastomeric material as claimed in claim 1, in which the partitioning agent is present in an amount within the range of 0.05 to 5.0% by weight of the elastomeric material.
References Cited (Backward Citations)
US2879173A
Cited
US3005795A
Cited
US3597372A
Cited
US3864124A
Cited
US3940455A
Cited
US4042747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |