US3248856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for filling columns for separation by gaseous chromatography
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1963-05-27
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Granted: 1966-05-03
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Guillemin Claude
- 👤 Wetroff George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR LOADING GASEOUS CHROMATOGRAPHIC COLUMNS OF LARGE DIAMETER WITH A FILLING MATERIAL IN PARTICULATE FORM TO PROVIDE A PACKING OF HIGH HOMOGENEITY COMPRISING INTRODUCING THE FULL COMPLEMENT OF CHROMATOGRAPHIC FILLING MATERIAL INTO THE COLUMN, PASSING A GASEOUS CURRENT INTO THE COLUMN UPWARDLY THROUGH THE FILLING MATERIAL IN THE COLUMN AT A HIGH VELOCITY SUFFICIENT TO FLUIDIZE THE MATERIAL, THEREAFTER REDUCING THE RATE OF GASEOUS FLOW UPWARDLY THROUGH THE FILLING MATERIAL IN THE COLUMN BY AN AMOUNT TO ALLOW THE FILLING MATERIAL GRADUALLY TO SETTLE IN THE COLUMN INTO A RELATIVELY FIXED BED OF HIGH HOMOGENEITY THROUGH WHICH THE GASEOUS CARRIER CONTAINING THE MIXTURE OF CHEMICAL COMPOUNDS TO BE PROCESSED IS ADVANCED FOR SEPARATION, AND PASSING SAID CARRIER GAS CONTAINING SAID MIXTURE OF CHEMICAL COMPOUNDS THROUGH SAID SETTLED COLUMN.
Claim 2
Dependent Claim
130 words
A PROCESS FOR LOADING GASEOUS CHROMATOGRAPHIC COLUMNS OF LARGE DIAMETER WITH A FILLING MATERIAL IN PARTICULATE FORM TO PROVIDE A PACKING OF HIGH HOMOGENEITY COMPRISING INTRODUCING THE FULL COMPLEMENT OF CHROMATOGRAPHIC FILLING MATERIAL INTO THE COLUMN, PASSING A GASEOUS CURRENT INTO THE COLUMN UPWARDLY THROUGH THE FILLING MATERIAL IN THE COLUMN AT A HIGH VELOCITY SUFFICIENT TO FLUIDIZE THE MATERIAL, THEREAFTER REDUCING THE RATE OF GASEOUS FLOW UPWARDLY THROUGH THE FILLING MATERIAL IN THE COLUMN BY AN AMOUNT TO ALLOW THE FILLING MATERIAL GRADUALLY TO SETTLE IN THE COLUMN INTO A RELATIVELY FIXED BED OF HIGH HOMOGENEITY THROUGH WHICH THE GASEOUS CARRIER CONTAINING THE MIXTURE OF CHEMICAL COMPOUNDS TO BE PROCESSED IS ADVANCED FOR SEPARATION, AND PASSING SAID CARRIER GAS CONTAINING SAID MIXTURE OF CHEMICAL COMPOUNDS THROUGH SAID SETTLED COLUMN.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |