US2779755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupriferous trisazo dyestuffs
Assignee: Saul and Co
•
Filing: 1952-03-03
•
Granted: 1957-01-29
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Expires: 1972-03-03
Abstract
No abstract record available.
Inventors
- 👤 Ruckstuhl Hans
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:21
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/24; C09B45/28; C09B35/00; C09B35/36; C09B35/366
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COPPER COMPLEX COMPOUND OF A TRISAZO DYESTUFF CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
12 words
A COPPER COMPLEX COMPOUND OF A TRISAZO DYESTUFF CORRESPONDING TO THE FORMULA
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |