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US3095385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethers containing nu-methylol groups
Assignee: Bayer AG
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Filing: 1957-11-26
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Granted: 1963-06-25
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Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Wagner Kuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:38
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A METHOD OF MAKING A WATER SOLUBLE POLYETHER HAVING A RELATIVELY LARGE NUMBER OF N-METHYLOL GROUPS AND A MOLECULAR WEIGHT OF AT LEAST ABOUT 700 WITHOUT UNDESIRABLE CROSS-LINKING WHICH COMPRISES FURTHER REACTING A WATER SOLUBLE POLYETHER HAVING ABOUT 2 TO ABOUT 8 BY WEIGHT OF METHYLOL GROUPS AND TERMINAL HYDROXYL GROUPS WHICH WAS PREPARED BY A PROCESS WHICH COMPRISES REACTING A MEMBER SELECTED FROM THE GROUP CONSISTING OF DIMETHYLOL, TRIMETHYLOL AND TETRAMETHYLOL SUBSTITUTED UREAS AND THIOUREAS WITH A DIFFERENT POLYHYDRIC ALCOHOL, WITH A MONOMERIC POLY-N-METHYLOL COMPOUND AT A PH OF AT LEAST ABOUT 6.2 AND A TEMPERATURE OF AT LEAST ABOUT 90*C. IN A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER AND ALCOHOL SOLVENTS FOR THE REACTION MIXTURE UNTIL A POLYETHER HAVING MORE N-METHYLOL GROUPS THAN THE INITIAL WATER-SOLUBLE POLYETHER IS OBTAINED.
Claim 2
Independent Claim
133 words
A METHOD OF MAKING A WATER SOLUBLE POLYETHER HAVING A RELATIVELY LARGE NUMBER OF N-METHYLOL GROUPS AND A MOLECULAR WEIGHT OF AT LEAST ABOUT 700 WITHOUT UNDESIRABLE CROSS-LINKING WHICH COMPRISES FURTHER REACTING A WATER SOLUBLE POLYETHER HAVING ABOUT 2 TO ABOUT 8 BY WEIGHT OF METHYLOL GROUPS AND TERMINAL HYDROXYL GROUPS WHICH WAS PREPARED BY A PROCESS WHICH COMPRISES REACTING A MEMBER SELECTED FROM THE GROUP CONSISTING OF DIMETHYLOL, TRIMETHYLOL AND TETRAMETHYLOL SUBSTITUTED UREAS AND THIOUREAS WITH A DIFFERENT POLYHYDRIC ALCOHOL, WITH A MONOMERIC POLY-N-METHYLOL COMPOUND AT A PH OF AT LEAST ABOUT 6.2 AND A TEMPERATURE OF AT LEAST ABOUT 90*C. IN A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER AND ALCOHOL SOLVENTS FOR THE REACTION MIXTURE UNTIL A POLYETHER HAVING MORE N-METHYLOL GROUPS THAN THE INITIAL WATER-SOLUBLE POLYETHER IS OBTAINED.
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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) | 1966-06-24 | 1966-12-24 | 1967-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-24 | 1970-12-24 | 1971-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-24 | 1974-12-24 | 1975-06-25 | $7700.00 | Window Closed / Lapsed |