US4182606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit extrusion die
Assignee: Celanese Corp
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Filing: 1978-06-14
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Granted: 1980-01-08
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Expires: 1998-06-14
Abstract
Abstract A slit extrusion die with a modified entry port which allows extrusion of a low denier tape at high draw down ratios is disclosed. The die has an entry port wherein the depth of the slit is greater at both ends than at the middle by an amount equal to 0.1 to 0.4 times the length of the slit.
Inventors
- 👤 John D. Gibbon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/30; B29C48/305; D01D4/00; D01D4/02; B29C48/001; B29C48/0018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
A die for overcoming draw resonance in extruded tapes at high melt draw down ratios comprising a slit die having an entry port which is greater in depth (d) at both ends than at the center by an amount equal to 0.1 to 0.4 times said slit's length.
Claim 2
Dependent Claim
48 words
A die for overcoming draw resonance in extruded tapes at high melt draw down ratios comprising a slit die having an entry port which is greater in depth (d) at both ends than at the center by an amount equal to 0.1 to 0.4 times said slit's length.
Claim 3
Dependent Claim
23 words
The die of claim 1 wherein the depth of the entry port progressively increases from the center of the slit to the ends.
Claim 4
Dependent Claim
24 words
The die as claimed in claim 1 wherein said increase in slit depth is accomplished by radiusing both ends of the die entry port.
Claim 5
Dependent Claim
20 words
The die as claimed in claim 3 wherein the radius is about 0.2 times the length of the die slit.
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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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |