Patent US3883557A successfully refreshed from Google Patents.
US3883557A
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US
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Trimethylfluoran compounds
Assignee: WTA Inc
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Filing: 1974-06-26
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Granted: 1975-05-13
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Expires: 1994-06-26
Abstract
Abstract WHEREIN EACH R is hydrogen, phenyl, benzyl, cyclohexyl, or an alkyl having one to five carbon atoms and R'' is hydrogen or chlorine. These compounds are used in pressure-sensitive record material and in markforming manifold systems. Colorless, but colorable trimethylfluoran compounds are disclosed, which are represented by the formula
Inventors
- 👤 Sheldon Farber
- 👤 Arthur J Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:48
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
3 words
THE COMPOUND 1'',3'',4''-TRIMETHYL-6''-BENZYLAMINOFLUORAN.
Claim 2
Dependent Claim
3 words
THE COMPOUND 1'',3'',4''-TRIMETHYL-6''-BENZYLAMINOFLUORAN.
Claim 3
Dependent Claim
3 words
The compound 1'',2'',3''-trimethyl-6''-benzylaminofluoran.
Claim 4
Dependent Claim
3 words
The compound 1'',2'',3''-trimethyl-6''-benzylaminofluoran.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |