US2856420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoro- and perfluorochlorocarboxylic acid esters of amino alcohols
Assignee: 3M Co
•
Filing: 1955-12-15
•
Granted: 1958-10-14
•
Expires: 1975-12-15
Abstract
No abstract record available.
Inventors
- 👤 Jr George H Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:27
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08K; C08K5/00; C08K5/16; C08K5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A FLUORINE-CONTAINING CARBOXYLIC ACID ESTER, SAID CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF PERFLUORO- AND PERFLUOROCHLORO-CARBOXYLIC ACIDS, OF AN N,N,N'',-TETRAKIS-(HYDROXYALKYL)-ALKYLENE DIAMINE CONTAINING FROM 6 TO 30 CARBON ATOMS IN THE ALKYLENE GROUP AND HAVING NOT MORE THAN 10 CARBON ATOMS PER HYDROXYALKYL GROUP, SAID ESTER CONTAINING AT LEAST ONE PERFLUOROHALOCYL GROUP HAVE BETWEEN 2 AND ABOUT 20 CARBON ATOMS.
Claim 2
Dependent Claim
60 words
A FLUORINE-CONTAINING CARBOXYLIC ACID ESTER, SAID CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF PERFLUORO- AND PERFLUOROCHLORO-CARBOXYLIC ACIDS, OF AN N,N,N'',-TETRAKIS-(HYDROXYALKYL)-ALKYLENE DIAMINE CONTAINING FROM 6 TO 30 CARBON ATOMS IN THE ALKYLENE GROUP AND HAVING NOT MORE THAN 10 CARBON ATOMS PER HYDROXYALKYL GROUP, SAID ESTER CONTAINING AT LEAST ONE PERFLUOROHALOCYL GROUP HAVE BETWEEN 2 AND ABOUT 20 CARBON ATOMS.
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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |