US3815833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for grinding thermoplastic material
Assignee: Fluid Energy Processing and Equipment Co
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Filing: 1973-01-08
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Granted: 1974-06-11
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Expires: 1993-01-08
Abstract
Abstract A method and apparatus for grinding thermoplastic material utilizing a jet and anvil type mill where the particular material to be ground is injected into a chamber against a rotating anvil means while also injecting a liquid into the chamber, the liquid evaporating to cool and embrittle the particles, and then accelerating and re-injecting the particles into the chamber while the liquid continues to be injected for evaporation.
Inventors
- 👤 Vliet E Van
- 👤 W Dostmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
The method of claim 1 wherein the reinjection takes place at a plurality of positions around the periphery of said chamber.
Claim 2
Dependent Claim
16 words
The method of claim 1 wherein the cooling liquid is injected at a plurality of positions.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein additional gas under pressure is tangentially injected into said chamber to increase the rotational velocity of said particles in said chamber.
Claim 4
Dependent Claim
163 words
Apparatus for grinding granular thermoplastic material comprising an anvil frame rotatably mounted within a curvilinear housing, said anvil frame having an outer curvilinear surface and a plurality of anvils extending radially from said curvilinear surface, feed means for the introduction of material to be ground into said housing above the curvilinear surface of said anvil frame and into impact with said anvils during rotation of said anvil frame, liquid-injection means for injecting a coolant liquid into said housing above the curvilinear surface of said anvil frame, discharge means on the outer surface of said housing for the discharge of partially ground material circulating in said housing above the curvilinear surface of said anvil frame, gaseous fluid injector means for accelerating said partially ground material and injecting it into high velocity impact with said anvils during rotation of said anvil frame, and outlet means for discharging fully ground material, said outlet means being positioned radially inward of said discharge means for partially ground material.
Claim 5
Dependent Claim
15 words
The apparatus of claim 5 wherein there are a plurality of gaseous fluid injector means.
Claim 6
Dependent Claim
14 words
The apparatus of claim 5 wherein there are a plurality of liquid injection 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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |