US2678309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproof mixed haloalkyl phosphate-lower aliphatic acid ester of cellulose and process for preparation thereof
Assignee: Celanese Corp
•
Filing: 1950-05-18
•
Granted: 1954-05-11
•
Expires: 1970-05-18
Abstract
No abstract record available.
Inventors
- 👤 Norman Van Gorder
- 👤 Walter D Paist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:13
CPC Classifications
C; C08; C08B; C08B7/00; C08B3/00; C08B3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
IN A PROCESS FOR THE PRODUCTION OF NONFLAMMABLE LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIALS, THE STEP WHICH COMPRISES ESTERIFYING A LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIAL CONTAINING FREE HYDROXYL GROUPS WITH A HALOALKYLCHLOROPHOSPHONATE IN WHICH THE HALOGEN IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE.
Claim 2
Dependent Claim
49 words
IN A PROCESS FOR THE PRODUCTION OF NONFLAMMABLE LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIALS, THE STEP WHICH COMPRISES ESTERIFYING A LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIAL CONTAINING FREE HYDROXYL GROUPS WITH A HALOALKYLCHLOROPHOSPHONATE IN WHICH THE HALOGEN IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE.
Claim 3
Dependent Claim
23 words
LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIALS HAVING AT LEAST A PART OF THE HYDROXYL GROUPS THEREIN ESTERIFIED AND ATTACHED TO THE GROUP
Claim 4
Dependent Claim
23 words
LOWER ALIPHATIC ACID ESTER OF CELLULOSE MATERIALS HAVING AT LEAST A PART OF THE HYDROXYL GROUPS THEREIN ESTERIFIED AND ATTACHED TO THE GROUP
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Cited
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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) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |