US3671543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imidomethyl derivatives of 1,3,3-trimethylindolino-spiropyran
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1970-05-28
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Granted: 1972-06-20
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Expires: 1990-05-28
Abstract
Abstract Novel imidomethyl or amidomethyl derivatives of 1,3,3trimethylindolino-spiropyran are produced by reacting a 1,3,3trimethylindolino-spiropyran derivative with an imidomethylating or amidomethylating agent in the presence of a condensing agent and optionally in a solvent. These novel compounds are adapted to be used as a coloring matter for pressure sensitive copy papers and particularly as one component of a coloring matter for black pressure sensitive copy papers.
Inventors
- 👤 Koichl Koga
- 👤 Minoru Hatorl
- 👤 Takashi Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:15
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
3 words
Phthalimidomethyl-1,3,3-trimethyl-indolino- Beta -naphtho-spiropyran.
Claim 2
Dependent Claim
2 words
3,4,5,6-Tetrahydrophthalimidomethyl-1,3,3-trimethyl-indolino-Beta -naphtho-spiropyran.
Claim 3
Dependent Claim
2 words
Phthalimidomethyl-1,3,3-trimethyl-5-chloro-indolino-7''-bromo-Beta -naphtho-spiropyran.
Claim 4
Dependent Claim
3 words
Phthalimidomethyl-1,3,3-trimethylindolindolino-7''-bromo- Beta -naphtho-spiropyran.
Claim 5
Dependent Claim
3 words
3,4,5,6-Tetrahydrophthalimido-methyl-1,3,3-trimethyl-5-chloro-indolino- Beta -naphtho-spiropyran.
Claim 6
Dependent Claim
2 words
4-Methoxyphthalimidomethyl-1,3,3-trimethyl-5-chloro-indolino-Beta -naphtho-spiropyran.
Claim 7
Dependent Claim
3 words
4-Chlorophthalimidomethyl-1,3,3-trimethylindolino- Beta -naphtho-spiropyran.
Claim 8
Dependent Claim
3 words
3-Nitrophthalimidomethyl-1,3,3-trimethyl-5-nitro-indolino-7''-bromo- Beta -naphtho-spiropyran.
Claim 9
Dependent Claim
3 words
Phthalimidomethyl-1,3,3-trimethyl-5-methoxy-indolino Beta -naphtho-spiropyran.
Claim 10
Dependent Claim
4 words
Bis-(3,4,5,6-tetrahydrophthalimidomethyl) 1,3,3-trimethyl-5-methoxy-indolino- Beta -naphtho-spiropyran.
References Cited (Backward Citations)
US3100778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |