US2820770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of poly amides
Assignee: Industrial Rayon Corp
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Filing: 1954-12-07
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Granted: 1958-01-21
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Expires: 1974-12-07
Abstract
No abstract record available.
Inventors
- 👤 Seth R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD OF PREPARING A POLYAMIDE SUITABLE FOR MELT EXTRUSION COMPRISING THE STEPS OF HEATING BETWEEN ABOUT 150* AND 180*C. A MIXTURE COMPRISING SUBSTANTIALLY ANOMERIC EPSILON-CAPROLCTAM AND WASTE POLYAMIDE FORMED FROM A POLYAMIDE-FORMING MATERIAL SELECTED FROM THE GROUP CONSISTING OF EPSILON-AMINO CAPROIC ACID AND EPSILON-CAPROLACTAM; AND INCORPORATING SAID HEATED MIXTURE INTO QUANTITIES OF MONOMERIC EPSILONCAPROLACTAM UNDERGOING POLYMERIZATION.
Claim 2
Independent Claim
57 words
A METHOD OF PREPARING A POLYAMIDE SUITABLE FOR MELT EXTRUSION COMPRISING THE STEPS OF HEATING BETWEEN ABOUT 150* AND 180*C. A MIXTURE COMPRISING SUBSTANTIALLY ANOMERIC EPSILON-CAPROLCTAM AND WASTE POLYAMIDE FORMED FROM A POLYAMIDE-FORMING MATERIAL SELECTED FROM THE GROUP CONSISTING OF EPSILON-AMINO CAPROIC ACID AND EPSILON-CAPROLACTAM; AND INCORPORATING SAID HEATED MIXTURE INTO QUANTITIES OF MONOMERIC EPSILONCAPROLACTAM UNDERGOING POLYMERIZATION.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |