US2916488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitizing dyes containing the spiro (4.4) nonano (1, 2d) thiazole nucleus
Assignee: Unisys Corp
•
Filing: 1956-06-27
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Granted: 1959-12-08
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Expires: 1976-06-27
Abstract
No abstract record available.
Inventors
- 👤 Stevens George De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:38
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/60; C09; C09B; C09B23/00; C09B23/02; C09B23/04; C09B23/06; C09B23/14; C09B23/145; C09B23/146
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A DYE SELECTED FROM THE GROUP CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
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Cited
US1970656A
Cited
US2112140A
Cited
US2179990A
Cited
US2336843A
Cited
US2336463A
Cited
US2581932A
Cited
US2704714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |