Patent US4256785A successfully refreshed from Google Patents.
US4256785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pellet coating process
Assignee: Eastman Chemical Co
•
Filing: 1979-07-25
•
Granted: 1981-03-17
•
Expires: 1999-07-25
Abstract
Abstract Coated pellets are produced by forming pellets having about 20% or more void space, contacting the pellets with a suspension of polymeric particles, reducing the temperature of the particles to create a pressure differential between the voids and the atmosphere to draw in liquid from the suspension and filter polymeric particles on the surface to form a coating.
Inventors
- 👤 Clarence C. Dannelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:55
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; A; A23; A23K; A23K40/00; A23K40/30; A23K40/35; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5089; B01J13/00; B01J13/02; B01J13/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
Method of making coated particles comprising (a) forming particles which contain about 20% or more by volume of voids, (b) contacting the surface of said particles with a polymeric material suspended in a volatile liquid, (c) reducing the temperature of said particles while in contact with said suspended polymeric material an amount sufficient for the liquid from said suspension to be drawn into the voids of the particles as the outer surface of the particles filters and separates polymer particles to form a surface coating thereof.
Claim 2
Dependent Claim
86 words
Method of making coated particles comprising (a) forming particles which contain about 20% or more by volume of voids, (b) contacting the surface of said particles with a polymeric material suspended in a volatile liquid, (c) reducing the temperature of said particles while in contact with said suspended polymeric material an amount sufficient for the liquid from said suspension to be drawn into the voids of the particles as the outer surface of the particles filters and separates polymer particles to form a surface coating thereof.
Claim 3
Dependent Claim
30 words
Method according to claim 1 wherein said pellets are heated to a temperature of between about 125° C. and about 150° C. prior to being contacted by said polymeric dispersion.
Claim 4
Dependent Claim
19 words
Method according to claim 2 wherein said pellets are contacted by said polymeric dispersion at below about 25° C.
Claim 5
Dependent Claim
21 words
Method according to claim 1 wherein the coated pellets are subjected to a temperature sufficiently high to fuse the polymeric material.
Claim 6
Dependent Claim
24 words
Method according to claim 1 wherein the coating weight is between about 2 and about 15% based on the weight of the coated pellet.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |