Patent US2829140A successfully refreshed from Google Patents.
US2829140A
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US
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Azo dyestuffs containing heavy metal in complex union
Assignee: Novartis AG
•
Filing: 1953-10-22
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Granted: 1958-04-01
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Expires: 1973-10-22
Abstract
No abstract record available.
Inventors
- 👤 Schetty Guido
- 👤 Ackermann Hans
- 👤 Beffa Fabio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:29
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A DYESTUFF CONSISTING ESSENTIALLY OF A COMPLEX HEAVY METAL COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
13 words
A DYESTUFF CONSISTING ESSENTIALLY OF A COMPLEX HEAVY METAL COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2673199A
Cited
US2551056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |