US3832974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed coating apparatus
Assignee: UNIROYAL PLASTICS COMPANY Inc WORLD HEADQUARTERS MIDDLEBURY CT 06749 A CORP OF
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Filing: 1972-04-25
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Granted: 1974-09-03
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Expires: 1992-04-25
Abstract
Abstract Apparatus and method for effecting fluidized bed coating of a surface of an article, such as a mold for an auto mat, wherein an outside wall of a fluidized bed chamber containing a fluidized bed of powdered thermoplastic coating material has an opening into which the article is inserted thereby sealing the opening.
Inventors
- 👤 G Adams
- 👤 V Falkenau
- 👤 J Flood
- 👤 R Borton
- 👤 A Dabrowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:35
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
Apparatus for carrying out fluidized bed coating of articles with a particulate thermoplastic material comprising a primary fluidized bed chamber, means for continuously maintaining fluidized bed conditions therein, a plurality of secondary fluidized bed chambers, means for establishing, maintaining and discontinuing fluidized bed conditions in each of said secondary chambers independently of one another, an opening between the primary chamber and each of said secondary chambers such that the coating material may flow from one chamber to the other, and conduit and valve means for allowing free fluidized bed flow by gravity from said primary chamber into each of said secondary chambers and for closing off said primary chamber from each of said secondary chambers, said primary chamber being sufficiently elevated relative to said secondary chambers that fluidized bed can flow by gravity from said primary chamber into any of said secondary chambers when said valve means associated therewith allows said free fluidized bed flow, a wall of each of said secondary chambers having an opening adapted to temporarily receive, completely encircle and be sealed by an article so that the inwardly facing portion of the article is coated with particles from fluidized bed in a secondary chamber.
Claim 2
Dependent Claim
198 words
Apparatus for carrying out fluidized bed coating of articles with a particulate thermoplastic material comprising a primary fluidized bed chamber, means for continuously maintaining fluidized bed conditions therein, a plurality of secondary fluidized bed chambers, means for establishing, maintaining and discontinuing fluidized bed conditions in each of said secondary chambers independently of one another, an opening between the primary chamber and each of said secondary chambers such that the coating material may flow from one chamber to the other, and conduit and valve means for allowing free fluidized bed flow by gravity from said primary chamber into each of said secondary chambers and for closing off said primary chamber from each of said secondary chambers, said primary chamber being sufficiently elevated relative to said secondary chambers that fluidized bed can flow by gravity from said primary chamber into any of said secondary chambers when said valve means associated therewith allows said free fluidized bed flow, a wall of each of said secondary chambers having an opening adapted to temporarily receive, completely encircle and be sealed by an article so that the inwardly facing portion of the article is coated with particles from fluidized bed in a secondary chamber.
Claim 3
Dependent Claim
44 words
Apparatus as set forth in claim 1 wherein said valve means comprise flexible, inflatable bags which when inflated close said conduit means so as to prevent communication between the primary chamber and the secondary chambers and when deflated allows said free fluidized bed flow.
Claim 4
Dependent Claim
70 words
Apparatus as set forth in claim 2 further including powder receiving means located outside and adjacent to lower portions of the secondary chambers, and second conduit and valve means for allowing powder deposited in the lower portions of said secondary chambers upon discontinuance of fluidized bed conditions therein to flow by gravity therefrom into said powder receiving means and for closing off said secondary chambers from said powder receiving means.
Claim 5
Dependent Claim
50 words
Apparatus as set forth in claim 3 wherein said second valve means comprise flexible, inflatable bags which when inflated close said conduit means associated therewith so as to prevent flow from the secondary chambers and when deflated allow flow of powder from the secondary chambers into said powder receiving means.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |