Patent US2783228A successfully refreshed from Google Patents.
US2783228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitro derivatives of benzoyl leuco methylene blue
Assignee: NCR Voyix Corp
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Filing: 1955-06-27
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Granted: 1957-02-26
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Expires: 1975-06-27
Abstract
No abstract record available.
Inventors
- 👤 Clyde S Adams
- 👤 Marjorie J Cormack
- 👤 Frazier Mary Lou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:48
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
10 -NITROBENZOYL -3,7-BIS(DIMETHYLAMINO)PHENOTHIAZINE, HAVING THE STRUCTURE
Claim 2
Dependent Claim
6 words
10 -NITROBENZOYL -3,7-BIS(DIMETHYLAMINO)PHENOTHIAZINE, HAVING THE STRUCTURE
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |