Patent US4283533A successfully refreshed from Google Patents.
US4283533A
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N-type betaines of 2-hydroxy-1,1,2,3,3-pentahydroperfluoroalkylamines
Assignee: EIDP Inc
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Filing: 1979-11-09
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Granted: 1981-08-11
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Expires: 1999-11-09
Abstract
Abstract Amphoteric N-type betaines represented by the formula: ##STR1## wherein: R f is C 4 -C 20 perfluoroalkyl; R 1 and R 2 are methyl or, together with the N atom to which they are bonded, form a piperidino, morpholino, or N-alkyl(c 1 -C 4 )piperazino group; and m is a whole number between 1 and 4 are highly effective in reducing the surface tension of water and of aqueous solutions of inorganic electrolytes, and can be used in environments where non-amphoteric surfactants would fail, e.g. highly acidic oil well applications.
Inventors
- 👤 John W. Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:21
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/08; C07D295/084; C07D295/088; C07D295/14; C07D295/145; C07D295/15; C09; C09K; C09K23/00; C09K23/18; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
An amphoteric N-type betaine having surfactant properties represented by the formula: ##STR13## wherein R f is C 4 -C 20 perfluoroalkyl; R 1 and R 2 are methyl or, together with the N atom to which they are bonded, form a piperidino, morpholino, or N-alkyl (C 1 -C 4 ) piperazino; and m is a whole number between 1 and 4; and mixtures thereof.
Claim 2
Dependent Claim
64 words
An amphoteric N-type betaine having surfactant properties represented by the formula: ##STR13## wherein R f is C 4 -C 20 perfluoroalkyl; R 1 and R 2 are methyl or, together with the N atom to which they are bonded, form a piperidino, morpholino, or N-alkyl (C 1 -C 4 ) piperazino; and m is a whole number between 1 and 4; and mixtures thereof.
Claim 3
Dependent Claim
18 words
Mixtures of betaines of claim 1 wherein 80-90% of the R f groups contain 6 to 12 carbons.
Claim 4
Dependent Claim
16 words
Mixtures of claim 2 wherein 80-90% of said R f groups contain 6 to 10 carbons.
Claim 5
Dependent Claim
29 words
The betaine or mixtures of betaines of claim 1, 2 or 3 wherein the average of the chain lengths in the R f groups is 6 to 8 carbons.
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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |