Patent US2720442A successfully refreshed from Google Patents.
US2720442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating tows in tubes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1949-05-23
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Granted: 1955-10-11
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Expires: 1969-05-23
Abstract
No abstract record available.
Inventors
- 👤 James F Keggin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:26
CPC Classifications
D; D01; D01F; D01F4/00; D01D; D01D10/00; D01D10/04; D01D10/0436; D01D10/0481
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD OF TREATING IN A NON-TENSIONED CONDITION WITHOUT TANGLING A CONTINUOUS TOW OF ARTIFICAL PROTEIN FILAMENTS WHICH COMPRISES INTRODUCING A TOE OF SAID FILAMENTS INTO THE UPPER END OF A LONGITUDINALLY CONFINED DOWNWARDLY INCLINED TREATING ZONE OF RELATIVELY CONFINED CROSS-SECTIONAL AREA, PROPELLING SAID TOW WITH A CURRENT OF TREATING AND CARRYING LIQUID HAVING A SPECIFIC GRAVITY GREATER THAN THE SPECIFIC GRAVITY OF SAID TOW THROUGH SAID FIRST TREATING ZONE DOWNWARDLY FROM THE UPPER END THEREOF, SAID LIQUID COMPLETELY FILLING SAID ZONE, MOVING SAID LIQUID TOGETHER WITH THE TOW THEREIN OUT OF SAID FIRST TREATING ZONE AND DIRECTLY THEREFROM INTO THE LOWER END OF A SEOCND LONGITUDINALLY CONFINED UPWARDLY INCLINED TREATING ZONE OF RELATIVELY LARGE CROSS-SECTIONAL AREA IN COMPARISON WITH SAID FIRST ZONE, SAID LIQUID COMPLETELY FILLING SAID SECOND ZONE, CARRYING SAID TOW THROUGH SAID SECOND ZONE BY MOVING SAID LIQUID IN A NON-TURBULENT CONDITION THROUGH SAID SECOND TREATING ZONE AND WITHDRAWING SAID TOW FROM THE UPPER END OF SAID SECOND TREATING ZONE.
Claim 2
Independent Claim
163 words
A METHOD OF TREATING IN A NON-TENSIONED CONDITION WITHOUT TANGLING A CONTINUOUS TOW OF ARTIFICAL PROTEIN FILAMENTS WHICH COMPRISES INTRODUCING A TOE OF SAID FILAMENTS INTO THE UPPER END OF A LONGITUDINALLY CONFINED DOWNWARDLY INCLINED TREATING ZONE OF RELATIVELY CONFINED CROSS-SECTIONAL AREA, PROPELLING SAID TOW WITH A CURRENT OF TREATING AND CARRYING LIQUID HAVING A SPECIFIC GRAVITY GREATER THAN THE SPECIFIC GRAVITY OF SAID TOW THROUGH SAID FIRST TREATING ZONE DOWNWARDLY FROM THE UPPER END THEREOF, SAID LIQUID COMPLETELY FILLING SAID ZONE, MOVING SAID LIQUID TOGETHER WITH THE TOW THEREIN OUT OF SAID FIRST TREATING ZONE AND DIRECTLY THEREFROM INTO THE LOWER END OF A SEOCND LONGITUDINALLY CONFINED UPWARDLY INCLINED TREATING ZONE OF RELATIVELY LARGE CROSS-SECTIONAL AREA IN COMPARISON WITH SAID FIRST ZONE, SAID LIQUID COMPLETELY FILLING SAID SECOND ZONE, CARRYING SAID TOW THROUGH SAID SECOND ZONE BY MOVING SAID LIQUID IN A NON-TURBULENT CONDITION THROUGH SAID SECOND TREATING ZONE AND WITHDRAWING SAID TOW FROM THE UPPER END OF SAID SECOND TREATING ZONE.
References Cited (Backward Citations)
US430817A
Cited
FR439153A
Cited
US1403126A
Cited
US1825478A
Cited
US1702535A
Cited
US1871100A
Cited
US1913601A
Cited
US1917065A
Cited
GB467257A
Cited
US2149708A
Cited
US2131409A
Cited
US2313006A
Cited
US2156090A
Cited
US2267117A
Cited
US2377434A
Cited
US2371579A
Cited
US2383358A
Cited
US2493740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |