Patent US2808420A successfully refreshed from Google Patents.
US2808420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for making acid chlorides
Assignee: Eastman Kodak Co
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Filing: 1954-06-09
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Granted: 1957-10-01
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Expires: 1974-06-09
Abstract
No abstract record available.
Inventors
- 👤 Wilbert J Humphlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN THE PROCESS OF FORMING AN ACID CHLORIDE BY REACTING THIONYL CHLORIDE WITH AN ORGANIC MONOBASIC ACID WHICH IS REACTIVE WITH SAID THIONYL CHLORIDE TO FORM AN ACID CHLORIDE AND WHICH IS OF LOWER VOLATILITY THAN SAID THIONYL CHLORIDE, THE METHOD OF CONTINUOUSLY AND PROGRESSIVELY CONVERTING SAID ORGANIC MONOBASIC ACID TO THE CORRESPONDING ACID CHLORIDE WHICH COMPRISES ESTABLISHING A CONTINUOUS CIRCULATION OF THIONYL CHLORIDE IN A CYCLIC SYSTEM BY PROGRESSIVELY VAPORIZING THIONYL CHLORIDE IN A VAPORIZING ZONE, CONTINUOUSLY PASSING THIONYL CHLORIDE VAPORS FROM SAID VAPORIZING ZONE UPWARDLY THROUGH A REACTION ZONE DEFINED WITHIN A PACKED COLUMN EFFECTIVE TO CAUSE FLOW OF SAID VAPORS THROUGH A MULTIPLICITY OF TORTUOUS CONSTRICTED FLUID PASSAGES, PROGRESSIVELY CONDENSING THIONYL CHLORIDE VAPORS EMERGING AFTER PASSAGE THROUGH SAID REACTION ZONE, AND PROGRESSIVELY RETURNING THE RESULTING THIONYL CHLORIDE CONDENSATE TO SAID VAPORIZING ZONE, PROGRESSIVELY INTRODUCING SAID ORGANIC MONOBASIC ACID,
Claim 2
Dependent Claim
141 words
IN THE PROCESS OF FORMING AN ACID CHLORIDE BY REACTING THIONYL CHLORIDE WITH AN ORGANIC MONOBASIC ACID WHICH IS REACTIVE WITH SAID THIONYL CHLORIDE TO FORM AN ACID CHLORIDE AND WHICH IS OF LOWER VOLATILITY THAN SAID THIONYL CHLORIDE, THE METHOD OF CONTINUOUSLY AND PROGRESSIVELY CONVERTING SAID ORGANIC MONOBASIC ACID TO THE CORRESPONDING ACID CHLORIDE WHICH COMPRISES ESTABLISHING A CONTINUOUS CIRCULATION OF THIONYL CHLORIDE IN A CYCLIC SYSTEM BY PROGRESSIVELY VAPORIZING THIONYL CHLORIDE IN A VAPORIZING ZONE, CONTINUOUSLY PASSING THIONYL CHLORIDE VAPORS FROM SAID VAPORIZING ZONE UPWARDLY THROUGH A REACTION ZONE DEFINED WITHIN A PACKED COLUMN EFFECTIVE TO CAUSE FLOW OF SAID VAPORS THROUGH A MULTIPLICITY OF TORTUOUS CONSTRICTED FLUID PASSAGES, PROGRESSIVELY CONDENSING THIONYL CHLORIDE VAPORS EMERGING AFTER PASSAGE THROUGH SAID REACTION ZONE, AND PROGRESSIVELY RETURNING THE RESULTING THIONYL CHLORIDE CONDENSATE TO SAID VAPORIZING ZONE, PROGRESSIVELY INTRODUCING SAID ORGANIC MONOBASIC ACID,
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |