Patent US2358160A successfully refreshed from Google Patents.
Patent US3673161A successfully refreshed from Google Patents.
US3673161A
Expired / Lapsed
US
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Preparation of polymers of lactams with reduced crystallinity
Assignee: Individual
•
Filing: 1970-03-17
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Granted: 1972-06-27
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Expires: 1990-03-17
Abstract
Abstract Lactam polymers of reduced crystallinity are prepared by incorporating the salts of certain polyvalent cations.
Inventors
- 👤 Jan Sebenda
- 👤 Rudolf Puffr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:06
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
A method according to claim 1 wherein the polymerization is conducted above the meltIng point of the monomer but below the melting point of the polymer.
Claim 2
Dependent Claim
21 words
A method according to claim 1 wherein the salts are introduced in an amount between about 0.05 and 10 molecule percent.
Claim 3
Dependent Claim
19 words
A method according to claim 3 wherein the salts are introduced in an amount of about 1 molecule percent.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |