US2987534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Group iii-a element compounds
Assignee: Ethyl Corp
•
Filing: 1958-04-25
•
Granted: 1961-06-06
•
Expires: 1978-04-25
Abstract
No abstract record available.
Inventors
- 👤 Shapiro Hymin
- 👤 Witt Earl G De
- 👤 Jerome E Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:26
CPC Classifications
C; C07; C07F; C07F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A CYCLOPENTADIENYL ELEMENT COMPOUND HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
A CYCLOPENTADIENYL ELEMENT COMPOUND HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2012356A
Cited
US2272133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |