US2912434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of indenothiazoles and cyanine dyes therefrom
Assignee: Unisys Corp
•
Filing: 1955-08-22
•
Granted: 1959-11-10
•
Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Stevens George De
- 👤 Robert H Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:25
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/60; C09; C09B; C09B23/00; C09B23/0075; C09B23/02; C09B23/10; C09B23/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A DYE SELECTED FROM THE GROUP CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA;
Claim 2
Dependent Claim
12 words
A DYE SELECTED FROM THE GROUP CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA;
References Cited (Backward Citations)
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Cited
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US2066966A
Cited
US1970656A
Cited
US2186419A
Cited
US2336463A
Cited
US2338782A
Cited
US2455420A
Cited
US2475136A
Cited
US2496899A
Cited
US2581932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |