US2977334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives of ethylene/maleic anhydride copolymers
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-10-04
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Granted: 1961-03-28
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Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Jr George W Zopf
- 👤 John H Johnson
- 👤 Ross M Hedrick
- 👤 Joseph E Fields
- 👤 John M Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:19
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A PROCESS WHICH COMPRISES ESTERIFYING A SUBSTANTIALLY EQUIMOLAR COPOLYMER OF ETHYLENE/MALEIC ANHYDRIDE, WHEREIN THE REPEATING POLYMER STRUCTURE
Claim 2
Dependent Claim
17 words
A PROCESS WHICH COMPRISES ESTERIFYING A SUBSTANTIALLY EQUIMOLAR COPOLYMER OF ETHYLENE/MALEIC ANHYDRIDE, WHEREIN THE REPEATING POLYMER STRUCTURE
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) | 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 |