US2606202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monosulfuric acid esters of polyalkylene glycols
Assignee: Wyeth Holdings LLC
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Filing: 1948-12-08
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Granted: 1952-08-05
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Expires: 1968-12-08
Abstract
No abstract record available.
Inventors
- 👤 Hans Z Lecher
- 👤 Chao Tsai Hsiang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:47
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A PROCESS OF PRODUCING A MONOSULFURIC ESTER OF A POLYALKYLENE GLYCOL WHICH COMPRISES REACTING A POLYALKYLENE GLYCOL OF AN AVERAGE MOLECULAR WEIGHT FROM 190 TO 6000 IN A NON-AQUEOUS MEDIUM WITH A TERTIARY AMINE SULFUR TROXIDE ADDITION COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE THE MONOSULFURIC ESTER MAINTAINING THE REACTANTS IN INTIMATE CONTACT AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND A DECOMPOSITION TEMPERATURE OF THE AMINE SULFUR TRIOXIDE ADDITION PRODUCT UNTIL SAID ADDITION PRODUCT IS SUBSTANTIALLY COMPLETELY CONSUMED.
Claim 2
Dependent Claim
78 words
A PROCESS OF PRODUCING A MONOSULFURIC ESTER OF A POLYALKYLENE GLYCOL WHICH COMPRISES REACTING A POLYALKYLENE GLYCOL OF AN AVERAGE MOLECULAR WEIGHT FROM 190 TO 6000 IN A NON-AQUEOUS MEDIUM WITH A TERTIARY AMINE SULFUR TROXIDE ADDITION COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE THE MONOSULFURIC ESTER MAINTAINING THE REACTANTS IN INTIMATE CONTACT AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND A DECOMPOSITION TEMPERATURE OF THE AMINE SULFUR TRIOXIDE ADDITION PRODUCT UNTIL SAID ADDITION PRODUCT IS SUBSTANTIALLY COMPLETELY CONSUMED.
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) | 1955-08-05 | 1956-02-04 | 1956-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-05 | 1960-02-04 | 1960-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-05 | 1964-02-04 | 1964-08-05 | $7700.00 | Window Closed / Lapsed |