Patent US5711294A successfully refreshed from Google Patents.
US2756221A
Expired / Lapsed
US
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Linear polyamides and methods of making same
Assignee: Eastman Kodak Co
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Filing: 1953-10-07
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Granted: 1956-07-24
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Expires: 1973-10-07
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:54
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/40; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
A POLYAMIDE OF A DIAMINE CONTAINING AT LEAST ONE HYDROGEN ATOM ON EACH AMINO NITROGEN ATOM AND A 4''4''ALKYLENEDIBENZOIC ACID WHEREIN THE ALKYLENE RADICAL HAS A BRANCHED CHAIN AND CONTAINS FROM 3 TO 6 CARBON ATOMS.
References Cited (Backward Citations)
US2191556A
Cited
US2327116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |