US3237380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatography purification process
Assignee: Monsanto Chemicals Ltd
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Filing: 1961-02-03
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Granted: 1966-03-01
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Expires: 1981-02-03
Abstract
No abstract record available.
Inventors
- 👤 Barrett Jack Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:08
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/02; G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084; G01N30/50; G01N30/58; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR PURIFYING A METALLIC OR SEMIMETALLIC SUBSTANCE, WHICH COMPRISES PASSING THE APOR OF THE METALLIC OR SEMIMETALLIC SUBSTANCE IN AN IMPURE CONDITION AND AT A TEMPERATURE ABOVE 750*C. THROUGH A GAS CHROMATOGRAPHIC COLUMN AND THEN ISOLATING THE PURIFIED SUBSTANCE.
Claim 2
Dependent Claim
41 words
A PROCESS FOR PURIFYING A METALLIC OR SEMIMETALLIC SUBSTANCE, WHICH COMPRISES PASSING THE APOR OF THE METALLIC OR SEMIMETALLIC SUBSTANCE IN AN IMPURE CONDITION AND AT A TEMPERATURE ABOVE 750*C. THROUGH A GAS CHROMATOGRAPHIC COLUMN AND THEN ISOLATING THE PURIFIED SUBSTANCE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |