Patent US2636030A successfully refreshed from Google Patents.
US2636030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper-containing disazo dyestuffs
Assignee: —
•
Filing: —
•
Granted: 1953-04-21
•
Expires: 1970-04-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:40
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/18; C09B56/00; C09B56/04; C09B45/22; C09B45/24; C09B45/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
THE COMPLEX COPPER COMPOUND OF A DISAZODYESTUFF HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
11 words
THE COMPLEX COPPER COMPOUND OF A DISAZODYESTUFF HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2123748A
Cited
US2175815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |