US3668189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent polycarbonamides
Assignee: Honeywell International Inc
•
Filing: 1970-08-24
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Granted: 1972-06-06
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Expires: 1990-08-24
Abstract
Abstract Nylons are conventionally prepared by the condensation polymerization of diamines with dibasic acids. If there is incorporated into the polymerization charge from about 0.1 to 100 moles per 10,000 moles of conventional dibasic acid; a diacid, diester, diamide diacid chloride or diamidediamine of a fusedring, polynuclear aromatic hydrocarbon having at least three fused rings, the thereby resulting nylon is fluorescent.
Inventors
- 👤 Frederick J Goetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; D; D01; D01F; D01F6/00; D01F6/78; D01F6/80; D01F6/805
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A polyamide in accordance with claim 1 wherein said fused ring polynuclear aromatic hydrocarbon is selected from the group consisting of anthracene, perylene and 1:2, 3:4 dibenzathracene.
Claim 2
Dependent Claim
16 words
A polyamide in accordance with claim 1 wherein said R is a C2 to C12 polymethylene.
Claim 3
Dependent Claim
12 words
A polyamide in accordance with claim 3 wherein said R is hexamethylene.
References Cited (Backward Citations)
US3301827A
Cited
US3542734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |