US3562295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Macrocyclic polyether compounds and ionic complexes thereof
Assignee: EIDP Inc
•
Filing: 1968-12-18
•
Granted: 1971-02-09
•
Expires: 1988-12-18
Abstract
Abstract MACROCYCLIC POLYETHER "CROWN" COMPOUNDS CONSISTING OF OXYGEN ATOMS JOINED TO ADJOINING OXYGEN ATOMS BY CHAINS OF FROM 2 TO 3 CARBON ATOMS TO FORM A POLYETHER RING HAVING FROM 15 TO 30 ATOMS IN THE RING. RING CARBON ATOMS CAN BE C1-C4 ALKYL SUBSTITUTED. THE CROWN COMPOUNDS ARE PREPARED BY RING CLOSURE OF HALO-POLYETHERALCOHOL COMPOUNDS WITH, E.G., SODIUM HYDRIDE OR POTASSIUM T-BUTOXIDE ACCORDING TO THE WILLIAMSON SYNTHESIS. CROWN COMPOUNDS SO PREPARED FORM COMPLEXES WITH A WIDE VARIETY OF IONIC METAL COMPOUNDS, ESPECIALLY THOSE OF ALKALI METALS AND ALKALINE EARTH METALS, MAKING IT POSSIBLE TO USE CERTAIN CHEMICAL REAGENTS IN MEDIA WHEREIN THEY ARE NORMALLY INSOLUBLE.
Inventors
- 👤 Charles J Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:27
CPC Classifications
G; G01; G01N; G01N31/00; C; C07; C07D; C07D323/00; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |