Patent US2824884A successfully refreshed from Google Patents.
US2824884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amides of perchlorofluorocarboxylic acids and process for the preparation thereof
Assignee: 3M Co
•
Filing: 1955-04-05
•
Granted: 1958-02-25
•
Expires: 1975-04-05
Abstract
No abstract record available.
Inventors
- 👤 William S Barnhart
- 👤 Joseph L Zollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:25
CPC Classifications
C; C07; C07C; C07C243/00; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
AN AMIDE OF A PERCHLOROFLUOROCARBOXYLIC ACID HAVING FROM 4 TO 0 CARBOM ATOMS.
Claim 2
Dependent Claim
13 words
AN AMIDE OF A PERCHLOROFLUOROCARBOXYLIC ACID HAVING FROM 4 TO 0 CARBOM ATOMS.
Claim 3
Dependent Claim
37 words
A PROCESS WHICH COMPRISES REACTING A PERCHLOROFLUOROCARBOXYLIC ACID HALIDE HAVING FROM 4 TO 20 CARBON ATOMS WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, HYDRAZINE, HYDROXYLAMINE, METHYLENE DIAMINE, P-P''-DIAMINODIPHENYLMETHANE, SULFANILIC ACID AND LOWER ALKYL AMINES.
Claim 4
Dependent Claim
37 words
A PROCESS WHICH COMPRISES REACTING A PERCHLOROFLUOROCARBOXYLIC ACID HALIDE HAVING FROM 4 TO 20 CARBON ATOMS WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, HYDRAZINE, HYDROXYLAMINE, METHYLENE DIAMINE, P-P''-DIAMINODIPHENYLMETHANE, SULFANILIC ACID AND LOWER ALKYL AMINES.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |