US3697525A
Expired / Lapsed
US
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Fluorescent naphthalimide derivatives
Assignee: Mitsubishi Chemical Corp
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Filing: 1969-06-04
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Granted: 1972-10-10
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Expires: 1989-06-04
Abstract
Abstract Naphthalimide derivatives of the formula WHEREIN R1, R2, R3, and R4 are lower alkyl, R5 is hydrogen, lower alkyl or carbamoyl methyl, n is 2 or 3, and A is an anionic radical, are effective optical brighteners for acrylic fibers and cellulose acetate when dyed from an acid aqueous bath. They are prepared by quaternizing corresponding tertiary amines with inorganic or organic acids, lower alkyl esters which are known alkylating agents, or chloroacetamide.
Inventors
- 👤 Hitoshi Okada
- 👤 Seiichi Imahori
- 👤 Susumu Hirako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:25
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/14; D; D06; D06L; D06L4/00; D06L4/60; D06L4/657; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/927
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
5 words
The compound having the formula
Claim 2
Dependent Claim
5 words
The compound having the formula
Claim 3
Dependent Claim
5 words
The compound having the formula
Claim 4
Dependent Claim
22 words
A compound as set forth in claim 1, wherein R1 R2, R3, R4, and R5 are each methyl, and n is 3.
Claim 5
Dependent Claim
25 words
A compound as set forth in claim 1, wherein R1 R2, and R5 are methyl, and R3 and R4 are ethyl, and n is 2.
Claim 6
Dependent Claim
24 words
A compound as set forth in claim 1, wherein R1, R2, R3, and R4 are methyl, and R5 is ethyl, and n is 3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |