US3565794A
Expired / Lapsed
US
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Ester and amide compounds of pyroglutamic acid as selective solvents for petroleum hydrocarbons
Assignee: LEANORD
•
Filing: 1967-03-15
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Granted: 1971-02-23
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Expires: 1987-03-15
Abstract
Abstract THIS INVENTION RELATES TO NEW ESTER AND AMIDE COMPOUNDS OF PYROGLUTAMIC ACID, POSSESSING REMARKABLE SOLVENT PROPERTIES, FOR USE NOTABLY IN SELECTIVE EXTRACTION OF AROMATIC COMPOUNDS IN PETROLEUM PRODUCTS.
Inventors
- 👤 Pierre Charles Elie Pigache
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:15
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |