US2921928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of copolymer diamides
Assignee: Monsanto Chemicals Ltd
•
Filing: 1957-11-29
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Granted: 1960-01-19
•
Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Fields
- 👤 John H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
IN THE PROCESS OF PREPARING POLYAMIDES FROM ALIPHATIC OLEFIN-MALEIC ANHYDRIDE COPOLYMERS, THE STEP WHICH COMPRISES HEATING AN AMIDE-SALT OF THE FORMULA
Claim 2
Dependent Claim
21 words
IN THE PROCESS OF PREPARING POLYAMIDES FROM ALIPHATIC OLEFIN-MALEIC ANHYDRIDE COPOLYMERS, THE STEP WHICH COMPRISES HEATING AN AMIDE-SALT OF THE FORMULA
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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |