Patent US2950313A successfully refreshed from Google Patents.
US2950313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface active polyoxypropylene esters
Assignee: Visco Products Co
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Filing: 1957-07-02
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Granted: 1960-08-23
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Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 Willard H Kirkpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:31
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A POLYOXYPROPYLENE COMPOUND HAVING A TERMINAL HYDROXY GROUP WHICH HAS BEEN ESTERIFIED WITH A CARBOXY ACYL GROUP, SAID POLYOXYPROPYLENE COMPOUND HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 1200, THE MAJOR PROPORTION OF THE AVERAGE MOLECULAR WEIGHT OF SAID ESTER BEING ATTRIBUTABLE TO OXYPROPYLENE GROUPS, SAID ESTER CONTAINING ONLY ONE OXYPROPYLENE CHAIN AND HAVING A MOLECULAR WEIGHT NOT EXCEEDING 7500.
Claim 2
Dependent Claim
60 words
A POLYOXYPROPYLENE COMPOUND HAVING A TERMINAL HYDROXY GROUP WHICH HAS BEEN ESTERIFIED WITH A CARBOXY ACYL GROUP, SAID POLYOXYPROPYLENE COMPOUND HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 1200, THE MAJOR PROPORTION OF THE AVERAGE MOLECULAR WEIGHT OF SAID ESTER BEING ATTRIBUTABLE TO OXYPROPYLENE GROUPS, SAID ESTER CONTAINING ONLY ONE OXYPROPYLENE CHAIN AND HAVING A MOLECULAR WEIGHT NOT EXCEEDING 7500.
References Cited (Backward Citations)
US2562878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |