Patent US2532622A successfully refreshed from Google Patents.
US2532622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organo silicon derivatives of cellulose
Assignee: Dow Silicones Corp
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Filing: 1949-02-23
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Granted: 1950-12-05
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Melvin J Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING FO CELLULOSE ETHERS AND CELLULOSE ESTERS HAVING FROM 1 TO 2.75 ETHER AND ESTER GROUPS PER GLUCOSE UNIT AND IN WHICH DERIVATIVE THERE ARE FROM 0.25 TO 2 TRIORGANOSILYL RADICALS PER GLUCOSE UNIT, SAID RADICALS BEING (R2R''SI-) WHERE R IS AN ARYL RADICAL AND R'' IS SELECTED FROM THE GROUP CONSISTING OF ARYL AND ALKYL RADICALS, THE SILICON ATOMS OF SLAID ORGANOSILYL RADICALS BEING ATTACHED THROUGH AN OXYGEN ATOM TO A CARBON ATOM OF A GLUCOSE UNIT, WHICH CARBON ATOM WOULD NORMALLY CARRY A HYDROXYL GROUP.
Claim 2
Dependent Claim
94 words
A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING FO CELLULOSE ETHERS AND CELLULOSE ESTERS HAVING FROM 1 TO 2.75 ETHER AND ESTER GROUPS PER GLUCOSE UNIT AND IN WHICH DERIVATIVE THERE ARE FROM 0.25 TO 2 TRIORGANOSILYL RADICALS PER GLUCOSE UNIT, SAID RADICALS BEING (R2R''SI-) WHERE R IS AN ARYL RADICAL AND R'' IS SELECTED FROM THE GROUP CONSISTING OF ARYL AND ALKYL RADICALS, THE SILICON ATOMS OF SLAID ORGANOSILYL RADICALS BEING ATTACHED THROUGH AN OXYGEN ATOM TO A CARBON ATOM OF A GLUCOSE UNIT, WHICH CARBON ATOM WOULD NORMALLY CARRY A HYDROXYL GROUP.
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) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |