US3683047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of block copolymers
Assignee: Individual
•
Filing: 1969-11-20
•
Granted: 1972-08-08
•
Expires: 1989-11-20
Abstract
Abstract A process for producing new type block-copolymers by polycondensation at a temperature below 250*C. of at least two different prepolymers selected from the group consisting of the four prepolyamides represented by the following general formulas: I. H2N NH2 ii. H2N NH2 iii. HOOC COOH iv. HOOC COOH, wherein A and B are different and represent polyamides having a molecular weight of from 1,000 to 4,000.
Inventors
- 👤 Makoto Honda
- 👤 Kenichiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:29
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
A method according to claim 1, wherein A and B each represent poly(1,2-cyclobutane dimethylene adipamide) and poly(hexamethylene adipamide).
Claim 2
Dependent Claim
17 words
A method according to claim 1, wherein A and B each represent poly(1,2-cyclobutane dimethylene adipamide) and polycaproamide.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein A and B each represent polyundecamide and poly(paraxylene-5-oxa-undecamide).
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein A and B each represent poly(paraxylene dodecamide) and poly(1,2-cyclobutane dimethylene adipamide).
Claim 5
Dependent Claim
17 words
A method according to claim 1, wherein A and B each represent poly(hexamethylene dodecamide) and poly (paraxylene-5-oxa-undecamide.
References Cited (Backward Citations)
US2193529A
Cited
US2130948A
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US2852485A
Cited
GB828264A
Cited
US3160677A
Cited
GB979103A
Cited
US3432575A
Cited
US3195603A
Cited
US3393252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |