Patent US3344119A successfully refreshed from Google Patents.
US3344119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyoxymethylenes
Assignee: Evonik Operations GmbH
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Filing: 1965-04-05
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Granted: 1967-09-26
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Schweitzer Otto
- 👤 Querfurth Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:50
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PROCESS FOR THE POLYMERIZATION OF MONOMERIC WATER FREE FORMALDEHYDE IN AN INERT ORGANIC SOLVENT IN THE PRESENCE OF A REDOX SYSTEM CATALYST COMPOSED OF DITERTIARY BUTYL PEROXIDE AND OXIDIZING COMPONENT AND TRI-NBUTYL AMINE AS REDUCING COMPONENT TO PRODUCE POLYOXYMETHYLENES, THE STEP WHICH COMPRISES CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF A SALT OF AN ORGANIC ACID CONTAINING AT LEAST 5 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF FATTY ACIDS, NAPHTHENIC ACIDS AND ABIETIC ACID WITH A METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CALCIUM AND STRONTIUM DISSOLVED IN SUCH INERT ORGANIC SOLVENT, THE QUANTITY OF SAID SALT BEING 0.01 TO 10 MILLIMOL PER LITER OF INERT SOLVENT USED AS THE REACTION MEDIUM AND THE QUANTITY OF REDOX CATALYST SYSTEM EMPLOYED BEING 0.01 TO 10% BASED ON THE SOLVENT EMPLOYED, THE RATIO OF OXIDIZING COMPONENT IN SAID SYSTEM BEING 0.5 TO 2.5 MOL PER MOL OF REDUCING COMPONENT.
Claim 2
Dependent Claim
152 words
IN A PROCESS FOR THE POLYMERIZATION OF MONOMERIC WATER FREE FORMALDEHYDE IN AN INERT ORGANIC SOLVENT IN THE PRESENCE OF A REDOX SYSTEM CATALYST COMPOSED OF DITERTIARY BUTYL PEROXIDE AND OXIDIZING COMPONENT AND TRI-NBUTYL AMINE AS REDUCING COMPONENT TO PRODUCE POLYOXYMETHYLENES, THE STEP WHICH COMPRISES CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF A SALT OF AN ORGANIC ACID CONTAINING AT LEAST 5 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF FATTY ACIDS, NAPHTHENIC ACIDS AND ABIETIC ACID WITH A METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CALCIUM AND STRONTIUM DISSOLVED IN SUCH INERT ORGANIC SOLVENT, THE QUANTITY OF SAID SALT BEING 0.01 TO 10 MILLIMOL PER LITER OF INERT SOLVENT USED AS THE REACTION MEDIUM AND THE QUANTITY OF REDOX CATALYST SYSTEM EMPLOYED BEING 0.01 TO 10% BASED ON THE SOLVENT EMPLOYED, THE RATIO OF OXIDIZING COMPONENT IN SAID SYSTEM BEING 0.5 TO 2.5 MOL PER MOL OF REDUCING COMPONENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |