US3326985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytrimethylene glycol
Assignee: Shell USA Inc
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Filing: 1964-12-29
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Granted: 1967-06-20
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Expires: 1984-12-29
Abstract
No abstract record available.
Inventors
- 👤 Ronald F Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/13; C07C43/135; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR THE PREPARATION OF POLYTRIMETHYLENE GLYCOLS HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 1200 TO ABOUT 1400 AND AN AVERAGE DIHYDROXY TERMINATION IN EXCESS OF 95% WHICH COMPRISES VACUUM STRIPPING POLYTRIMETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 900 IN A CURRENT OF NITROGEN AT A TEMPERATURE OF FROM ABOUT 200* TO 240*C. AND AT A PRESSURE OF FROM 1 TO 8 MM. MERCURY FOR SUFFICIENT TIME TO OBTAIN POLYTRIMETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 1200 TO 1400.
Claim 2
Dependent Claim
85 words
A PROCESS FOR THE PREPARATION OF POLYTRIMETHYLENE GLYCOLS HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 1200 TO ABOUT 1400 AND AN AVERAGE DIHYDROXY TERMINATION IN EXCESS OF 95% WHICH COMPRISES VACUUM STRIPPING POLYTRIMETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 900 IN A CURRENT OF NITROGEN AT A TEMPERATURE OF FROM ABOUT 200* TO 240*C. AND AT A PRESSURE OF FROM 1 TO 8 MM. MERCURY FOR SUFFICIENT TIME TO OBTAIN POLYTRIMETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 1200 TO 1400.
References Cited (Backward Citations)
US2520733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |