Patent US2931789A successfully refreshed from Google Patents.
US2931789A
Expired / Lapsed
US
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Polyamides from pinic acid
Assignee: Akzo Nobel UK PLC
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Filing: 1958-04-25
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Granted: 1960-04-05
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Expires: 1978-04-25
Abstract
No abstract record available.
Inventors
- 👤 Edward A Wielicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:32
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A HOMOPOLYMER HAVING THE FOLLOWING RECURRING STRUCTURAL UNITS:
Claim 2
Dependent Claim
8 words
A HOMOPOLYMER HAVING THE FOLLOWING RECURRING STRUCTURAL UNITS:
References Cited (Backward Citations)
US2130523A
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US2130947A
Cited
US2193529A
Cited
US2158064A
Cited
US2188332A
Cited
US2309729A
Cited
GB632997A
Cited
US2625536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |