Patent US2594145A successfully refreshed from Google Patents.
US2594145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction products of an nu-acyl polyimide of a polycarboxylic acid with a polymer containing hydroxy or amino radicals
Assignee: Wingfoot Corp
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Filing: 1950-04-29
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Granted: 1952-04-22
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Expires: 1970-04-29
Abstract
No abstract record available.
Inventors
- 👤 Paul J Flory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR INCREASING THE MOLECULAR WEIGHT OF A POLYMER CONTAINING AT LEAST TWO RADICALS SELECTED FROM THE GROUP CONSISTING OF HYDROXYL RADICALS AND AMINO RADICALS CONTAINING AT LEAST ONE REACTIVE HYDROGEN ATOM WHICH COMPRISES HEATING SAID POLYMER WITH AN N-ACYL POLYIMIDE OFA POLYCARBOXYLIC ACID IN WHICH EACH OF THE CARBONYL GROUPS OF THE ACYL RADICAL IS ATTACHED TO THE NITROGEN ATOM OF AN IMIDO RADICAL.
Claim 2
Independent Claim
66 words
A METHOD FOR INCREASING THE MOLECULAR WEIGHT OF A POLYMER CONTAINING AT LEAST TWO RADICALS SELECTED FROM THE GROUP CONSISTING OF HYDROXYL RADICALS AND AMINO RADICALS CONTAINING AT LEAST ONE REACTIVE HYDROGEN ATOM WHICH COMPRISES HEATING SAID POLYMER WITH AN N-ACYL POLYIMIDE OFA POLYCARBOXYLIC ACID IN WHICH EACH OF THE CARBONYL GROUPS OF THE ACYL RADICAL IS ATTACHED TO THE NITROGEN ATOM OF AN IMIDO RADICAL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |