Patent US3418275A successfully refreshed from Google Patents.
US3418275A
Expired / Lapsed
US
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Aromatic polyamides from n,n'-diphenyl diamines
Assignee: EIDP Inc
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Filing: 1966-07-06
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Granted: 1968-12-24
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Expires: 1986-07-06
Abstract
No abstract record available.
Inventors
- 👤 Stephens Curtis Wayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/08; C08G69/12; C08G71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A FIBER-FORMING NITROGEN-CONTAINING LINEAR CONDENSATION POLYMER CONSISTING ESSENTIALLY OF RECURRING STRUCTURAL UNITS OF ONE OF THE FOLLOWING:
Claim 2
Dependent Claim
17 words
A FIBER-FORMING NITROGEN-CONTAINING LINEAR CONDENSATION POLYMER CONSISTING ESSENTIALLY OF RECURRING STRUCTURAL UNITS OF ONE OF THE FOLLOWING:
References Cited (Backward Citations)
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Cited
US2149286A
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US3094511A
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US3164571A
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US3264270A
Cited
US3232910A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |