Patent US695614A successfully refreshed from Google Patents.
Patent US2735844A successfully refreshed from Google Patents.
US2735844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium-containing azo dyestuffs
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:47
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/06; C09B31/068; C09B31/072; C09B45/00; C09B45/02; C09B45/24; C09B45/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A CHROMIUM-CONTAINING AZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
9 words
A CHROMIUM-CONTAINING AZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |