Patent US3131428A successfully refreshed from Google Patents.
US3131428A
Expired / Lapsed
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Spinneret and spinning method
Assignee: Celanese Corp
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Filing: 1958-12-19
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Granted: 1964-05-05
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Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 John P Mika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:16
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A SPINNERETTE HAVING AT LEAST ONE JET OPENING HAVING FOUR SIDES, ONE PAIR OF OPPOSITE SIDES BEING SUBSTANTIALLY STRAIGHT AND EQUAL IN LENGTH, THE OTHER PAIR OF OPPOSITE SIDES BEING CIRCULAR ARCS CONCAVE IN A DIRECTION AWAY FROM THE INTERIOR OF SAID OPENING AND HAVING A RADIUS OF CURVATURE ABOUT 20 TO 35% OF THE LENGTH OF ONE OF SAID STRAIGHT SIDES.
Claim 2
Dependent Claim
62 words
A SPINNERETTE HAVING AT LEAST ONE JET OPENING HAVING FOUR SIDES, ONE PAIR OF OPPOSITE SIDES BEING SUBSTANTIALLY STRAIGHT AND EQUAL IN LENGTH, THE OTHER PAIR OF OPPOSITE SIDES BEING CIRCULAR ARCS CONCAVE IN A DIRECTION AWAY FROM THE INTERIOR OF SAID OPENING AND HAVING A RADIUS OF CURVATURE ABOUT 20 TO 35% OF THE LENGTH OF ONE OF SAID STRAIGHT SIDES.
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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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |