US3670467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacturing tumbling media
Assignee: ROBERT H WALKER
•
Filing: 1970-04-27
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Granted: 1972-06-20
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Expires: 1990-04-27
Abstract
Abstract Extruding a plastic abrasive mix through a multi-hole die adapted to combine emerging strands of the mix into a single strand whereby the strands move at the same linear rate. The single strand is cut into large pellets of uniform length, after which they are divided into smaller pellets corresponding to the original number, size, and shape of each of the combined strands and cured.
Inventors
- 👤 Robert H Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:38
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/12; B24B31/14; B28; B28B; B28B11/00; B28B11/14; B28B11/16; B28B3/00; B28B3/20; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A method according to claim 1 wherein the compacting step comprises: passing the continuous converging strands of plastic mix through a chamber having an entrance corresponding in shape and size to a first outline around and which encompasses the holes and a relatively smaller exit corresponding in shape and size to a second outline around and which encompasses the compacted strands.
Claim 2
Dependent Claim
17 words
A method according to claim 1 wherein the dividing step comprises: drying and agitating the large pellets.
Claim 3
Dependent Claim
34 words
A method according to claim 1 wherein the extruding step comprises: extruding continuous strands of uniform polygon shape and size by providing the die with converging holes of corresponding uniform polygon shape and size.
Claim 4
Dependent Claim
56 words
A method according to claim 4 wherein the compaction step comprises: passing the converging strands of uniform polygon shape and size through a tapered chamber having an entrance of a shape and size which corresponds to an outline around and which encompasses the converged polygon shaped holes and an exit of smaller size than the entrance.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |