US2977342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic linear polyamides in finely divided form
Assignee: Imperial Chemical Industries Ltd
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Filing: 1958-10-27
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Granted: 1961-03-28
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Expires: 1978-10-27
Abstract
No abstract record available.
Inventors
- 👤 Twitchett Harry James
- 👤 Wild Arthur Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:47
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2377/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR THE MANUFACTURE OF SYNTHETIC LINEAR POLYAMIDES SELECTED FROM THE GROUP CONSISTING OF POLYCAPROAMIDE AND POLYHEXAMETHYLENEADIPAMIDE IN A FINELY DIVIDED FORM WHICH COMPRISES ADDING A DILUTE AQUEOUS SOLUTION OF FORMIC ACID CONTAINING BETWEEN 17.5 AND 45% FORMIC ACID TO A SOLUTION OF THE SYNTHETIC LINEAR POLYAMIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF FORMIC ACID AND CONCENTRATED AQUEOUS SOLUTIONS OF FORMIC ACID CONTAINING NOT LESS THAN 80% FORMIC ACID AND ISOLATING THE FINELY DIVIDED SYNTHETIC POLYAMIDE WHICH IS PRECIPITATED, THE RESULTING MIXTURE OF FORMIC ACID SOLUTIONS CONTAINING BETWEEN 45% AND 70% BY WEIGHT OF FORMIC ACID.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE MANUFACTURE OF SYNTHETIC LINEAR POLYAMIDES SELECTED FROM THE GROUP CONSISTING OF POLYCAPROAMIDE AND POLYHEXAMETHYLENEADIPAMIDE IN A FINELY DIVIDED FORM WHICH COMPRISES ADDING A DILUTE AQUEOUS SOLUTION OF FORMIC ACID CONTAINING BETWEEN 17.5 AND 45% FORMIC ACID TO A SOLUTION OF THE SYNTHETIC LINEAR POLYAMIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF FORMIC ACID AND CONCENTRATED AQUEOUS SOLUTIONS OF FORMIC ACID CONTAINING NOT LESS THAN 80% FORMIC ACID AND ISOLATING THE FINELY DIVIDED SYNTHETIC POLYAMIDE WHICH IS PRECIPITATED, THE RESULTING MIXTURE OF FORMIC ACID SOLUTIONS CONTAINING BETWEEN 45% AND 70% BY WEIGHT OF FORMIC ACID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |