US4453867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc stirrer
Assignee: EIDP Inc
•
Filing: 1982-08-09
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Granted: 1984-06-12
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Expires: 2002-08-09
Abstract
Abstract A solid circular plate mounted above the existing stirrer in a melt grid spinning apparatus provides a positive hold-up time for melting flake descending from the melt grid to the melt pump beneath the grid.
Inventors
- 👤 David L. Sharps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:24
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B01; B01F; B01F27/00; B01F27/80; B01F27/82; B01F27/93; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/47; D; D01; D01D; D01D1/00; D01D1/04; B29C48/365
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
In an apparatus for melting particulate polymeric material including a melting grid, a collecting chamber for the molten polymer placed beneath the grid and a stirrer consisting of a driven central shaft coaxial with the collecting chamber and of a plurality of blades extending from the shaft and shaped to sweep the contour of the chamber, the improvement comprising: a circular plate having upper and lower surfaces and a peripheral edge mounted above the blades on said shaft perpendicular thereto, said plate having a diameter less than the diameter of the collecting chamber; a pair of vanes attached to the lower surface of the plate in opposite quadrants of the plate near its peripheral edge; and a pair of opposed curved ribs attached to the upper surface of said plate, each rib having an end extending below the peripheral edge of said plate.
Claim 2
Dependent Claim
143 words
In an apparatus for melting particulate polymeric material including a melting grid, a collecting chamber for the molten polymer placed beneath the grid and a stirrer consisting of a driven central shaft coaxial with the collecting chamber and of a plurality of blades extending from the shaft and shaped to sweep the contour of the chamber, the improvement comprising: a circular plate having upper and lower surfaces and a peripheral edge mounted above the blades on said shaft perpendicular thereto, said plate having a diameter less than the diameter of the collecting chamber; a pair of vanes attached to the lower surface of the plate in opposite quadrants of the plate near its peripheral edge; and a pair of opposed curved ribs attached to the upper surface of said plate, each rib having an end extending below the peripheral edge of said plate.
Claim 3
Dependent Claim
28 words
The apparatus as defined in claim 1, said collecting chamber having an inverted frusto-conical configuration, said plate having a diameter less than the upper diameter of the chamber.
Claim 4
Independent Claim
28 words
The apparatus as defined in claims 1 or 2, said plate having a plurality of relief holes centrally located connecting the upper and lower surfaces of the plate.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |