Patent US2950272A successfully refreshed from Google Patents.
US2950272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxyalkylene esters of tall oil rosin acids
Assignee: Visco Products Co
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Filing: 1957-03-25
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Granted: 1960-08-23
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 Willard H Kirkpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:21
CPC Classifications
C; C09; C09F; C09F1/00; C09F1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
AN ESTER HAVING THE FORMULAI
Claim 2
Dependent Claim
5 words
AN ESTER HAVING THE FORMULAI
References Cited (Backward Citations)
US2586767A
Cited
US2562878A
Cited
US2606178A
Cited
US2588970A
Cited
US2610966A
Cited
US2677700A
Cited
US2674619A
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 |