US2977355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali cellulose aging
Assignee: Celanese Corp
•
Filing: 1954-01-13
•
Granted: 1961-03-28
•
Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 William H Bradshaw
- 👤 Edward H Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:18
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/08; C08B1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
PROCESS FOR THE TREATMENT OF HEATED AGED SLURRY OF ALKALI CELLULOSE IN AQUEOUS CONTAINING STABLY DISPERSED BUBBLES OF GAS, SAID PROCESS COMPRISING DIRECTING A STREAM OF SAID HEATED AGED GASIFIED SLURRY IN A CURVED PATH INTO AN EVAPORATIVE ZONE WHEREBY SAID GASIFIED SLURRY IS SUBJECTED TO THE ACTION OF CENTRIFUGAL FORCE AND EVAPORATION TO REMOVE BUBBLES THEREFROM.
Claim 2
Dependent Claim
57 words
PROCESS FOR THE TREATMENT OF HEATED AGED SLURRY OF ALKALI CELLULOSE IN AQUEOUS CONTAINING STABLY DISPERSED BUBBLES OF GAS, SAID PROCESS COMPRISING DIRECTING A STREAM OF SAID HEATED AGED GASIFIED SLURRY IN A CURVED PATH INTO AN EVAPORATIVE ZONE WHEREBY SAID GASIFIED SLURRY IS SUBJECTED TO THE ACTION OF CENTRIFUGAL FORCE AND EVAPORATION TO REMOVE BUBBLES THEREFROM.
References Cited (Backward Citations)
US577362A
Cited
US1238672A
Cited
US1440808A
Cited
US1553973A
Cited
US1831586A
Cited
US2166300A
Cited
US2343317A
Cited
US2355057A
Cited
US2434596A
Cited
US2494427A
Cited
US2592680A
Cited
US2542492A
Cited
US2647114A
Cited
US2592355A
Cited
US2664963A
Cited
US2642950A
Cited
US2787615A
Cited
US2680738A
Cited
US2757581A
Cited
US2816490A
Cited
US2747002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |