Patent US2845423A successfully refreshed from Google Patents.
US2845423A
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N, n'-disubstituted-3, 7-diamino-polysulfodibenzothiophene-dioxides
Assignee: Honeywell International Inc
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Filing: 1955-12-07
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Granted: 1958-07-29
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Expires: 1975-12-07
Abstract
No abstract record available.
Inventors
- 👤 Norman L Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:13
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/16; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; A61K31/455; C07C; C07C323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A CHROMOPHORE-FREE UNSYMMETRICALLY N,N''-DISUBSTITUTED-3,7-DIAMINOPOLYSULFO-DIBENZOTHIOPHENE-DIOXIDE HAVING THE FORMULA
Claim 2
Dependent Claim
7 words
A CHROMOPHORE-FREE UNSYMMETRICALLY N,N''-DISUBSTITUTED-3,7-DIAMINOPOLYSULFO-DIBENZOTHIOPHENE-DIOXIDE HAVING THE FORMULA
References Cited (Backward Citations)
US2688617A
Cited
US2719155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |