US3236603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-column gas chromatographic apparatus
Assignee: Shell USA Inc
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Filing: 1962-09-28
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Granted: 1966-02-22
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Larry R Durrett
- 👤 Jr Milburn J O'neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/40; G01N2030/402; G01N2030/407; G01N30/46; G01N30/461; G01N30/468
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A GAS CHROMATOGRAPHIC APPARATUS WHICH COMPRISES: (A) A FIRST PARTITION COLUMN HAVING INET AND OUTLET ENDS, (B) A SECOND PARTITION COLUMN HAVING INET AND OUTLET ENDS, (C) MEANS TO INTRODUCE A CARRIER GAS CARRYING A FEED SAMPLE TO THE INLET END OF THE FIRST COLUMN FOR FORWARD FLOW THERETHROUGH, (D) DETECTOR MEANS CONNECTED TO RECEIVE THE EFFLUENT STREAM FROM THE OUTLET END OF SAID FIRST COLUMN FOR DETERMINING SUCCESSIVE CONSTITUENTS FLOWED THROUGH THE DETECTOR MEANS, (E) MEANS FOR FLOWING A CARRIER GAS THROUGH SAID FIRST COLUMN IN REVERSE DIRECTION TO CARRY OFF CNSTITUENTS RETAINED THEREIN AND FOR FLOWING THE RESULTING MIXTURE INTO THE INLET END OF SAID SECOND COLUMN FOR FORWARD FLOW THERETHROUGH, (F) MEANS FOR FLOWING THE EFFLUENT STREAM FROM THE OUTLET END OF SAID SCOND COLUMN TO SAID DETECTOR MEANS, AND (G) MEANS FOR BACKFLUSHING SAID SECOND COLUMN, INCLUDING MEANS FOR FLOWING A CARRIER GAS THROUGH SAID SECOND COLUMN IN REVERSE DIRECTION TO CARRY OFF CONSTITUENTS RETAINED THEREIN AND FOR FLOWING THE RESULTING MIXTUE STREAM TO SAID DETECTOR MEANS.
Claim 2
Dependent Claim
171 words
A GAS CHROMATOGRAPHIC APPARATUS WHICH COMPRISES: (A) A FIRST PARTITION COLUMN HAVING INET AND OUTLET ENDS, (B) A SECOND PARTITION COLUMN HAVING INET AND OUTLET ENDS, (C) MEANS TO INTRODUCE A CARRIER GAS CARRYING A FEED SAMPLE TO THE INLET END OF THE FIRST COLUMN FOR FORWARD FLOW THERETHROUGH, (D) DETECTOR MEANS CONNECTED TO RECEIVE THE EFFLUENT STREAM FROM THE OUTLET END OF SAID FIRST COLUMN FOR DETERMINING SUCCESSIVE CONSTITUENTS FLOWED THROUGH THE DETECTOR MEANS, (E) MEANS FOR FLOWING A CARRIER GAS THROUGH SAID FIRST COLUMN IN REVERSE DIRECTION TO CARRY OFF CNSTITUENTS RETAINED THEREIN AND FOR FLOWING THE RESULTING MIXTURE INTO THE INLET END OF SAID SECOND COLUMN FOR FORWARD FLOW THERETHROUGH, (F) MEANS FOR FLOWING THE EFFLUENT STREAM FROM THE OUTLET END OF SAID SCOND COLUMN TO SAID DETECTOR MEANS, AND (G) MEANS FOR BACKFLUSHING SAID SECOND COLUMN, INCLUDING MEANS FOR FLOWING A CARRIER GAS THROUGH SAID SECOND COLUMN IN REVERSE DIRECTION TO CARRY OFF CONSTITUENTS RETAINED THEREIN AND FOR FLOWING THE RESULTING MIXTUE STREAM TO SAID DETECTOR MEANS.
References Cited (Backward Citations)
US3111835A
Cited
US3152470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |