Patent US2831850A successfully refreshed from Google Patents.
US2831850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble monoazo dyestuffs
Assignee: Saul and Co
•
Filing: 1956-02-24
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Granted: 1958-04-22
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Expires: 1976-02-24
Abstract
No abstract record available.
Inventors
- 👤 Merian Ernest
- 👤 Bruno J R Nicolaus
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:51
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/124; C09B43/1245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A WATER-INSOLUBLE MONOAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
9 words
A WATER-INSOLUBLE MONOAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US1706484A
Cited
US1735960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |