US2553648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naphthoquinone compounds
Assignee: Research Corp
•
Filing: 1948-01-08
•
Granted: 1951-05-22
•
Expires: 1968-01-08
Abstract
No abstract record available.
Inventors
- 👤 Louis F Fieser
- 👤 Marlin T Leffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:20
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/12; C; C07; C07C; C07C46/00; C07C50/00; C07C50/10; C07C50/26; C07C50/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
CHEMICAL COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
5 words
CHEMICAL COMPOUNDS OF 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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |