Patent US2143196A successfully refreshed from Google Patents.
Patent US3148041A successfully refreshed from Google Patents.
US3148041A
Expired / Lapsed
US
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Recovery of chlorinated methanes
Assignee: PPG Industries Inc
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Filing: 1961-11-21
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Granted: 1964-09-08
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Expires: 1981-11-21
Abstract
No abstract record available.
Inventors
- 👤 Dehn Frederick Chris
- 👤 Robert E Feathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:39
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/01; C07C19/03; C07C19/041; C07C17/00; C07C17/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF RECOVERING CHLOROFORM, CARBON TETRACHLORIDE, METHYLENE CHLORIDE AND METHYL CHLORIDE PRESENT AS A GASEOUS MIXTURE PRODUCED BY THE CATALYTIC REACTION OF METHANE, AN OXYGEN CONTAINING GAS AND A CHLORINATING AGENT SELECTED FROM THE GROUP CONSISTING OF HCL, CL2 AND MIXTURES OF HCL AND CL2 AT ELEVATED TEMPERATURE, SAID MIXTURE CONTAINING BELOW 25 PERCENT CHLORINATED METHANES BY VOLUME, COMPRISING SCRUBBING SAID G ASEOUS MIXTURE WITH AN AQUEOUS ALKALINE SOLUTION AND CONTACTING THE GASEOUS MIXTURE SO SCRUBBED WITH A LIQUID HALOBENZENE THEREBY SELECTIVELY ABSORBING THE CHLORINATED METHANE CONTENT OF SAID MIXTURE IN SAID LIQUID HALOBENZENE AND RECOVERING THE CHLORINATED METHANES FROM SAID LIQUID HALOBENZENE.
Claim 2
Independent Claim
104 words
A METHOD OF RECOVERING CHLOROFORM, CARBON TETRACHLORIDE, METHYLENE CHLORIDE AND METHYL CHLORIDE PRESENT AS A GASEOUS MIXTURE PRODUCED BY THE CATALYTIC REACTION OF METHANE, AN OXYGEN CONTAINING GAS AND A CHLORINATING AGENT SELECTED FROM THE GROUP CONSISTING OF HCL, CL2 AND MIXTURES OF HCL AND CL2 AT ELEVATED TEMPERATURE, SAID MIXTURE CONTAINING BELOW 25 PERCENT CHLORINATED METHANES BY VOLUME, COMPRISING SCRUBBING SAID G ASEOUS MIXTURE WITH AN AQUEOUS ALKALINE SOLUTION AND CONTACTING THE GASEOUS MIXTURE SO SCRUBBED WITH A LIQUID HALOBENZENE THEREBY SELECTIVELY ABSORBING THE CHLORINATED METHANE CONTENT OF SAID MIXTURE IN SAID LIQUID HALOBENZENE AND RECOVERING THE CHLORINATED METHANES FROM SAID LIQUID HALOBENZENE.
References Cited (Backward Citations)
CA615106A
Cited
US2585469A
Cited
US2750002A
Cited
US2858347A
Cited
US2841243A
Cited
US2989571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |