Patent US3230212A successfully refreshed from Google Patents.
US3230212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked cellulosic polymer
Assignee: Individual
•
Filing: 1960-04-27
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Granted: 1966-01-18
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Expires: 1980-04-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick A H Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:03
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/10; C06; C06B; C06B21/00; C06B21/0008; C06B21/0016; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
THE PROCESS OF CROSS-LINKING A CELLULOSE MATERIAL COMPRISING OXIDIZING SAID MATEIAL TO FORM CARBOXYLIC ACID GROUPS AND FUNCTIONAL GROUPS CONSISTING OF ALDEHYDES AND KETONES IN THE MOLECULE OF THE MATERIAL, SELECTIVELY REDUCING SAID FUNCTIONAL GROUPS TO THE CORRESPONDING ALCOHOL THEREBY TO PRODUCE A CELULOSE PRODUCT CONTAINING HYDROXYL GROUPS AND CARBOXYLIC ACID GROUPS, TREATING SAID PRODUCT WITH THIONYL CHLORIDE TO FORM THE ACID CHLORIDE THEREOF AND REACTING SAID ACID CHLORIDE PRODUCT WITH A POLYFUNCTIONAL ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYHYROXYL COMPOUNDS AND POLYAMINO COMPOUNDS TO CROSS-LINK SAID PRODUCT THEREWITH.
Claim 2
Dependent Claim
91 words
THE PROCESS OF CROSS-LINKING A CELLULOSE MATERIAL COMPRISING OXIDIZING SAID MATEIAL TO FORM CARBOXYLIC ACID GROUPS AND FUNCTIONAL GROUPS CONSISTING OF ALDEHYDES AND KETONES IN THE MOLECULE OF THE MATERIAL, SELECTIVELY REDUCING SAID FUNCTIONAL GROUPS TO THE CORRESPONDING ALCOHOL THEREBY TO PRODUCE A CELULOSE PRODUCT CONTAINING HYDROXYL GROUPS AND CARBOXYLIC ACID GROUPS, TREATING SAID PRODUCT WITH THIONYL CHLORIDE TO FORM THE ACID CHLORIDE THEREOF AND REACTING SAID ACID CHLORIDE PRODUCT WITH A POLYFUNCTIONAL ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYHYROXYL COMPOUNDS AND POLYAMINO COMPOUNDS TO CROSS-LINK SAID PRODUCT THEREWITH.
Claim 3
Dependent Claim
63 words
A COMPOSITION OF MATTER COMPRISING A CELLULOSIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF CROSSLINKED CELLULOSE AND CROSS-LINKED CELLULOSE DERIVATIVES WHICH HAS BEEN TREATED PRIOR TO CROSS-LINKING SO AS TO FORM ACID CHLORIDE GROUPS THEREON AND WHICH HS BEEN CROSS-LINKED THROUGH REACTION BETWEEN SAID ACID CHLORIDE GROUPS AND A POLYFUCTIONAL ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYHYDROXYL COMPOUNDS AND POLYAMINO COMPOUNDS.
Claim 4
Dependent Claim
63 words
A COMPOSITION OF MATTER COMPRISING A CELLULOSIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF CROSSLINKED CELLULOSE AND CROSS-LINKED CELLULOSE DERIVATIVES WHICH HAS BEEN TREATED PRIOR TO CROSS-LINKING SO AS TO FORM ACID CHLORIDE GROUPS THEREON AND WHICH HS BEEN CROSS-LINKED THROUGH REACTION BETWEEN SAID ACID CHLORIDE GROUPS AND A POLYFUCTIONAL ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYHYDROXYL COMPOUNDS AND POLYAMINO COMPOUNDS.
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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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |