US2980696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalein and fluorescein derivatives
Assignee: Individual
•
Filing: 1957-10-10
•
Granted: 1961-04-18
•
Expires: 1977-10-10
Abstract
No abstract record available.
Inventors
- 👤 Korbl Jiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:41
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/06; C09B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A METHOD OF PRODUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Independent Claim
12 words
A METHOD OF PRODUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
CH298194A
Cited
US2745720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |