Patent US3047992A successfully refreshed from Google Patents.
US3047992A
Expired / Lapsed
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Chromatographic analysis
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1958-08-18
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Granted: 1962-08-07
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Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:03
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/56; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/14; B01J20/281; B01J20/282; B01J20/283; B01J20/30; B01J20/3085; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
IN A CHROMATOGRAPHIC SEPARATION, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS A SUBSTRATE SUPPORT A FIREBRICK MATERIAL HAVING BEEN TREATED WITH NITRIC ACID HAVING A STRENGTH OF ABOUT 12 N AND UTILIZING DIMETHYL FORMAMIDE AS A SUBSTRATE.
Claim 2
Dependent Claim
36 words
IN A CHROMATOGRAPHIC SEPARATION, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS A SUBSTRATE SUPPORT A FIREBRICK MATERIAL HAVING BEEN TREATED WITH NITRIC ACID HAVING A STRENGTH OF ABOUT 12 N AND UTILIZING DIMETHYL FORMAMIDE AS A SUBSTRATE.
References Cited (Backward Citations)
US2701240A
Cited
US2875849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-06 | 1966-02-05 | 1966-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-06 | 1970-02-05 | 1970-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-06 | 1974-02-05 | 1974-08-07 | $7700.00 | Window Closed / Lapsed |