Patent US2765325A successfully refreshed from Google Patents.
US2765325A
Expired / Lapsed
US
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Surface active polyamides
Assignee: Rohm and Haas Co
•
Filing: 1953-05-26
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Granted: 1956-10-02
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Expires: 1973-05-26
Abstract
No abstract record available.
Inventors
- 👤 Warren D Niederhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:00
CPC Classifications
C; C07; C07C; C07C233/00; C09; C09D; C09D177/00; C09K; C09K23/00; C09K23/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A PROCESS FOR PREPARING POLYAMIEDS WHICH COMPRISES REACTING BETWEEN 125* AND ABOUT 175* C. IN ABOUT MOLAR PROPORTIONS WITH EVOLUTION OF ABOUT ONE MOLAR PROPORTION OF WATER A MONOCARBOXYLIC ACID AND THE STRUCTURE RCOOH, WHERE R IS A HYDROCARBON GROUP OF 7 TO 23 CARBON ATOMS, AND A POLYALKYLENEPOLYAMINE OF THE FORMULA
Claim 2
Dependent Claim
52 words
A PROCESS FOR PREPARING POLYAMIEDS WHICH COMPRISES REACTING BETWEEN 125* AND ABOUT 175* C. IN ABOUT MOLAR PROPORTIONS WITH EVOLUTION OF ABOUT ONE MOLAR PROPORTION OF WATER A MONOCARBOXYLIC ACID AND THE STRUCTURE RCOOH, WHERE R IS A HYDROCARBON GROUP OF 7 TO 23 CARBON ATOMS, AND A POLYALKYLENEPOLYAMINE OF THE FORMULA
Claim 3
Dependent Claim
5 words
POLYAMIDES OF THE GENERAL STRUCTURE
Claim 4
Dependent Claim
5 words
POLYAMIDES OF THE GENERAL STRUCTURE
References Cited (Backward Citations)
US1947951A
Cited
US2453057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |