Patent US3144871A successfully refreshed from Google Patents.
US3144871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of tobacco with organic solvents in the vapour phase
Assignee: Imperial Tobacco Company of Canada Ltd
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Filing: 1962-06-04
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Granted: 1964-08-18
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Expires: 1982-06-04
Abstract
No abstract record available.
Inventors
- 👤 Souza John Edwin De
- 👤 Rice Robert Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:07
CPC Classifications
A; A24; A24B; A24B3/00; A24B3/18; A24B3/182; Y; Y10; Y10S; Y10S131/00; Y10S131/902; Y10S131/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR TREATING TOBACCO TO IMPROVE ITS FILLING CAPACITY WHICHCOMPRISES THE STEPS OF SUBJECTING TOBACCO TO SOLVENT VAPOR AND SUBSEQUENTLY DRYING THE TOBACCO IN THE ABSENCE OF SOLVENT TO REMOVER SOLVENT VAPOR FROM THE TOBACCO, SAID STEP OF SUBJECTING THE TOBACCO TO SOLVENT VAPOR CONSISTING OF SUBJECTING THE TOBACCO,AT ATMOSPHERIC PRESSURE AND FOR A PREDETERMINED PERIOD, TO VAPOR OF A NON-AQUEOUS SOLVENT MAINTAINED AT A TEMPEATURE OF FROM ABOUT 64 TO 100*C., SAID SOLVENT BEING SELECTED FROM THE GROUP OF ALIPHATIC HYDROCARBONS, AROMATIC HY-
Claim 2
Dependent Claim
85 words
A PROCESS FOR TREATING TOBACCO TO IMPROVE ITS FILLING CAPACITY WHICHCOMPRISES THE STEPS OF SUBJECTING TOBACCO TO SOLVENT VAPOR AND SUBSEQUENTLY DRYING THE TOBACCO IN THE ABSENCE OF SOLVENT TO REMOVER SOLVENT VAPOR FROM THE TOBACCO, SAID STEP OF SUBJECTING THE TOBACCO TO SOLVENT VAPOR CONSISTING OF SUBJECTING THE TOBACCO,AT ATMOSPHERIC PRESSURE AND FOR A PREDETERMINED PERIOD, TO VAPOR OF A NON-AQUEOUS SOLVENT MAINTAINED AT A TEMPEATURE OF FROM ABOUT 64 TO 100*C., SAID SOLVENT BEING SELECTED FROM THE GROUP OF ALIPHATIC HYDROCARBONS, AROMATIC HY-
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) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |