US2787615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of viscose
Assignee: Akzo Nobel UK PLC
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Filing: 1953-01-30
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Granted: 1957-04-02
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Expires: 1973-01-30
Abstract
No abstract record available.
Inventors
- 👤 Weigham William Reginald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:59
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF PRODUCING VISCOSE SUITABLE FOR THE MANUFACTURE OF REGENERATED CELLULOSE PRODUCTS IN WHICH THERE IS THE STEP OF MIXING CELLULOSE XANTHATE AND DILUTE CAUSTIC SODA SOLUTION IN A FIRST CONTAINER AT A TEMPERATURE HIGHER THAN A PREDETERMINED TEMPERATURE TO BE USED IN A SUBSEQUENT AGEING STEP, THEREAFTER THE STEP OF CAUSING THE VISCOSE TO FLOW CONTINUOUSLY IN A THIN SHEET THROUGH A VACUUM UNDER CONDITIONS SUCH THAT BUBBLES FROM THE MIXING STEP ARE BOILED OFF, CARRYING AWAY THE LATENT HEAT OF VAPORIZATION THEREBY COOLING THE VISCOSE, AND THEN THE STEP OF STORING THE THUS COOLED VISCOSE IN ANOTHER CONTAINER AND AGEING IT AT THE PREDETERMINED AGEING TEMPERATURE.
Claim 2
Independent Claim
109 words
A METHOD OF PRODUCING VISCOSE SUITABLE FOR THE MANUFACTURE OF REGENERATED CELLULOSE PRODUCTS IN WHICH THERE IS THE STEP OF MIXING CELLULOSE XANTHATE AND DILUTE CAUSTIC SODA SOLUTION IN A FIRST CONTAINER AT A TEMPERATURE HIGHER THAN A PREDETERMINED TEMPERATURE TO BE USED IN A SUBSEQUENT AGEING STEP, THEREAFTER THE STEP OF CAUSING THE VISCOSE TO FLOW CONTINUOUSLY IN A THIN SHEET THROUGH A VACUUM UNDER CONDITIONS SUCH THAT BUBBLES FROM THE MIXING STEP ARE BOILED OFF, CARRYING AWAY THE LATENT HEAT OF VAPORIZATION THEREBY COOLING THE VISCOSE, AND THEN THE STEP OF STORING THE THUS COOLED VISCOSE IN ANOTHER CONTAINER AND AGEING IT AT THE PREDETERMINED AGEING TEMPERATURE.
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) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |