Patent US3189558A successfully refreshed from Google Patents.
US3189558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis (phenyltolyl) ether chromatographic adsorption media
Assignee: Individual
•
Filing: 1964-06-03
•
Granted: 1965-06-15
•
Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 James D Doedens
- 👤 Howard P Cordts
- 👤 David F Wisniewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/292; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
AN IMPROVED CHROMATOGRAPHIC ADSORPTION MEDIUM COMPRISING A MAJOR PROPORTION OF AN INERT PARTICULATE PACKING MATERIAL AND A MINOR PROPORTION OF A LIQUID CONDENSATION PRODUCT OF 4,4''-DI(CHLOROMETHYL)DIPHENYL OXIDE WITH A BENZENOID HYDROCARBON HAVING THE FORMULA
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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |