US2915552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing polyfluorochlorinated carboxylic acids
Assignee: 3M Co
•
Filing: 1954-08-27
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Granted: 1959-12-01
•
Expires: 1974-08-27
Abstract
No abstract record available.
Inventors
- 👤 William S Barnhart
- 👤 Robert H Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:18
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/15; C07C53/19; C07C53/21; C07C51/00; C07C51/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
PROCESS FOR PRODUCING A PERHALOGENATED CARBOXYLIC ACID WHICH COMPRISES REACTING WITH THE CHLORIDE OF A METAL HAVING A VALENCE OF AT LEAST 3. A FLUOROPERHALOALKANE HAVING THE FORMULA Q1-(CF2CX1F)N-Q2. WHEREIN X1, Q1 AND Q2 ARE HALOGEN ATOMS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE AND N IS AN INTEGER FROM 2 TO 3, AND THEREAFTER REACTING THE PRODUCT IN LIQUID PHASE UNDER ATMOSPHERIC PRESSURE AT A TEMPERATURE FROM 125*C. TO ABOUT 200*C. WITH FUMING SULFURIC ACID HAVING UP TO ABOUT 30 PERCENT EXCESS SO3.
Claim 2
Dependent Claim
86 words
PROCESS FOR PRODUCING A PERHALOGENATED CARBOXYLIC ACID WHICH COMPRISES REACTING WITH THE CHLORIDE OF A METAL HAVING A VALENCE OF AT LEAST 3. A FLUOROPERHALOALKANE HAVING THE FORMULA Q1-(CF2CX1F)N-Q2. WHEREIN X1, Q1 AND Q2 ARE HALOGEN ATOMS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE AND N IS AN INTEGER FROM 2 TO 3, AND THEREAFTER REACTING THE PRODUCT IN LIQUID PHASE UNDER ATMOSPHERIC PRESSURE AT A TEMPERATURE FROM 125*C. TO ABOUT 200*C. WITH FUMING SULFURIC ACID HAVING UP TO ABOUT 30 PERCENT EXCESS SO3.
References Cited (Backward Citations)
US2806866A
Cited
US2398430A
Cited
US2440800A
Cited
US2396076A
Cited
GB581628A
Cited
US2562547A
Cited
US2453146A
Cited
US2598411A
Cited
US2559629A
Cited
US2806865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |