Patent US3316919A successfully refreshed from Google Patents.
US3316919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of smoking tobacco
Assignee: Brown and Williamson Holdings Inc
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Filing: 1964-04-21
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Granted: 1967-05-02
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Expires: 1984-04-21
Abstract
No abstract record available.
Inventors
- 👤 Green Sydney James
- 👤 Fordyce William Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:40
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/18; A24B15/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A METHOD OF TREATING TOBACCO COMPRISING PREPARING A BED OF GROUND TOBACCO DISPOSED ON A FILTERING MEANS HAVING A POROSITY SUCH THAT A SOLVENT PASSING THROUGH THE BED IS CONTROLLED AT A SUFFICIENT RATE SO AS TO OBVIATE SUBSTANTIALLY DECOMPOSITION OF THE MORE UNSTABLE TOBACCO AROMA AND FLAVOR CONSTITUENTS CONTAINED IN THE LIQUOR; EXTRACTING THE GROUND TOBACCO WITH AN ICE-COLD SOLVENT BY PERCOLATION OF THE SOLVENT THROUGH THE BED OF TOBACCO; RAPIDLY FREEZING THE LIQUOR BY SUBJECTING THE LIQUOR TO A TEMPERATURE SUBSTANTIALLY BELOW THE FREEZING POINT OF THE SOLVENT SO THAT ALL THE MATERIAL EXTRACTED REMAINS SUBSTANTIALLY INVOLATILE AND CHEMICALLY INERT AND THEN FREEZE DRYING THE FROZEN LIQUOR BY SUBJECTING THE FROZEN LIQUOR TO REDUCED PRESSURES WHILE MAINTAINING THE LIQUOR IN A FROZEN STATE UNTIL THE FLAVOR AND AROMA CONSTITUENTS EXTRACTED FROM THE TOBACCO ARE FREE OF SOLVENT.
Claim 2
Independent Claim
139 words
A METHOD OF TREATING TOBACCO COMPRISING PREPARING A BED OF GROUND TOBACCO DISPOSED ON A FILTERING MEANS HAVING A POROSITY SUCH THAT A SOLVENT PASSING THROUGH THE BED IS CONTROLLED AT A SUFFICIENT RATE SO AS TO OBVIATE SUBSTANTIALLY DECOMPOSITION OF THE MORE UNSTABLE TOBACCO AROMA AND FLAVOR CONSTITUENTS CONTAINED IN THE LIQUOR; EXTRACTING THE GROUND TOBACCO WITH AN ICE-COLD SOLVENT BY PERCOLATION OF THE SOLVENT THROUGH THE BED OF TOBACCO; RAPIDLY FREEZING THE LIQUOR BY SUBJECTING THE LIQUOR TO A TEMPERATURE SUBSTANTIALLY BELOW THE FREEZING POINT OF THE SOLVENT SO THAT ALL THE MATERIAL EXTRACTED REMAINS SUBSTANTIALLY INVOLATILE AND CHEMICALLY INERT AND THEN FREEZE DRYING THE FROZEN LIQUOR BY SUBJECTING THE FROZEN LIQUOR TO REDUCED PRESSURES WHILE MAINTAINING THE LIQUOR IN A FROZEN STATE UNTIL THE FLAVOR AND AROMA CONSTITUENTS EXTRACTED FROM THE TOBACCO ARE FREE OF SOLVENT.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |