US2664422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of water-soluble cellulose ethers
Assignee: Acordis UK Ltd
•
Filing: 1950-07-26
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Granted: 1953-12-29
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Expires: 1970-07-26
Abstract
No abstract record available.
Inventors
- 👤 Downing John
- 👤 Drewitt James Gordon Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:52
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
PROCESS FOR THE PRODUCTION OF CELLULOSE ETHERS, WHICH COMPRISES SUBJECTING ALKALI CELLULOSE OF PACKING DENSITY ABOVE 15 LB./CU. FT. TO THE SIMULTANEOUS ACTION, AT A TEMPERATURE ABOVE 65* C., OF THE VAPOURS OF METHYL CHLORIDE AND ANOTHER LOWER ALKYL CHLORIDE CONTAINING AT MOST 5 CARBON ATOMS, THE TOTAL AMOUNT OF ALKYL CHLORIDE BEING BETWEEN 1.75 AND 3 MOLECULAR PROPORTIONS FOR EACH MOLECULAR PROPORTION OF CELLULOSE (RECKONED AS ONE ANHYDROGLUCOSE UNIT) AND THE MOLECULAR RATIO OF METHYL CHLORIDE TO THE OTHER LOWER ALKYL CHLORIDE BEING BETWEEN 1:2 AND 1:20.
Claim 2
Dependent Claim
88 words
PROCESS FOR THE PRODUCTION OF CELLULOSE ETHERS, WHICH COMPRISES SUBJECTING ALKALI CELLULOSE OF PACKING DENSITY ABOVE 15 LB./CU. FT. TO THE SIMULTANEOUS ACTION, AT A TEMPERATURE ABOVE 65* C., OF THE VAPOURS OF METHYL CHLORIDE AND ANOTHER LOWER ALKYL CHLORIDE CONTAINING AT MOST 5 CARBON ATOMS, THE TOTAL AMOUNT OF ALKYL CHLORIDE BEING BETWEEN 1.75 AND 3 MOLECULAR PROPORTIONS FOR EACH MOLECULAR PROPORTION OF CELLULOSE (RECKONED AS ONE ANHYDROGLUCOSE UNIT) AND THE MOLECULAR RATIO OF METHYL CHLORIDE TO THE OTHER LOWER ALKYL CHLORIDE BEING BETWEEN 1:2 AND 1:20.
References Cited (Backward Citations)
GB302191A
Cited
US1867050A
Cited
US2067946A
Cited
US2149309A
Cited
US2149310A
Cited
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Cited
GB526330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |