US2651663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of poly-pentaerythritols
Assignee: Imperial Chemical Industries Ltd
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Filing: 1947-07-23
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Granted: 1953-09-08
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Expires: 1967-07-23
Abstract
No abstract record available.
Inventors
- 👤 Stanley F Marrian
- 👤 Mclean Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:19
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A PROCESS FOR THE PRODUCTION OF POLYPENTAERYTHRITOLS WHICH COMPRISES HEATING A MATERIAL FROM THE GROUP CONSISTING OF PENTAERYTHRITOL. POLYPENTAERYTHRITOLS OF LOWER MOLECULAR WEIGHT THAN THE DESIRED PRODUCT AND MIXTURES THEREOF AT A TEMPERATURE ABOVE 100* C. IN THE PRESENCE OF AN ORGANIC SULPHONIC ACID AND A WATER-IMMISCIBLE VOLATILE ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON AND CHLORINATED HYDROCARBON SOLVENTS WHICH ARE CHEMICALLY INERT TOWARD PENTAERYTHRITOL AND SAID ORGANIC SULPHONIC ACID AND REMOVING WATER FORMED FROM THE REACTION MIXTURE ALONG WITH VAPORS OF SAID ORGANIC SOLVENT BY DISTILLATION.
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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |