Patent US5698470A successfully refreshed from Google Patents.
Patent US2669556A successfully refreshed from Google Patents.
US2669556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing bis-(amino aryl) methane polyamides
Assignee: EIDP Inc
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Filing: 1953-02-24
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Granted: 1954-02-16
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Carleton A Sperati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:58
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A PROCESS FOR PREPARING POLYAMIDE RESINS FROM ALKANEDIOIC ACIDS AND DIAMINES OF THE FORMULA
Claim 2
Dependent Claim
14 words
A PROCESS FOR PREPARING POLYAMIDE RESINS FROM ALKANEDIOIC ACIDS AND DIAMINES OF THE FORMULA
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) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |