US3625947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N heterocyclic ethyl naphthalimides
Assignee: Nippon Kayaku Co Ltd
•
Filing: 1968-01-23
•
Granted: 1971-12-07
•
Expires: 1988-01-23
Abstract
Abstract The present invention is directed to novel naphthalimide derivatives which have been quaternized or made into a salt form and a method for preparing the same. The present compound is used in fluorescent whitening of various synthetic fibers, particularly polyacrylonitrile fibers.
Inventors
- 👤 Tamehiko Noguchi
- 👤 Mitsukuni Sumitani
- 👤 Kenkichi Tsukamoto
- 👤 Daisaku Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:45
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/02; C07D401/06; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
The compound according to claim 1, wherein the compound is represented by the following formula:
Claim 2
Dependent Claim
15 words
The compound according to claim 1, wherein the compound is represented by the following formula:
Claim 3
Dependent Claim
15 words
The compound according to claim 1, wherein the compound is represented by the following formula;
Claim 4
Dependent Claim
15 words
The compound according to claim 1, wherein the compound is represented by the following formula:
Claim 5
Dependent Claim
16 words
The compound according to claim 1, wherein the compound is represented by the following formula, .
References Cited (Backward Citations)
US3330834A
Cited
US3310564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |