US2495239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating cellulose
Assignee: Comptoir des Textiles Artificiels SA
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Filing: 1948-06-09
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Granted: 1950-01-24
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Expires: 1968-06-09
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Fays Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:48
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; C; C08; C08B; C08B15/00; C08B15/10; D01; D01F; D01F11/00; D01F11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE PROCESS WHICH COMPRISES CONDENSING IN ALKALINE MEDIUM P-TERT-AMYL-PHENOL AND FORMALDEHYDE IN MOLECULAR RATIO OF 1:2 AND REACTING THE CONDENSATION PRODUCT WITH CELLULOSIC MATERIAL CONTAINING FREE HYDROXYL GROUPS AND SUBJECTING THE REACTION PRODUCTS TO THERMAL TREATMENT TO FORM RESINIFORM BRIDGE LINKAGES BETWEEN THE CELLULOSE CHAINS.
Claim 2
Dependent Claim
45 words
THE PROCESS WHICH COMPRISES CONDENSING IN ALKALINE MEDIUM P-TERT-AMYL-PHENOL AND FORMALDEHYDE IN MOLECULAR RATIO OF 1:2 AND REACTING THE CONDENSATION PRODUCT WITH CELLULOSIC MATERIAL CONTAINING FREE HYDROXYL GROUPS AND SUBJECTING THE REACTION PRODUCTS TO THERMAL TREATMENT TO FORM RESINIFORM BRIDGE LINKAGES BETWEEN THE CELLULOSE CHAINS.
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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) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |