Patent US3328440A successfully refreshed from Google Patents.
US3328440A
Expired / Lapsed
US
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Antiknock compounds for gasoline fuels
Assignee: Ethyl Corp
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Filing: 1952-07-05
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Granted: 1967-06-27
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Expires: 1972-07-05
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
2026-11-04 18:47
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/10; C07; C07F; C07F17/00; C07F5/00; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C10L1/28; C10L1/301; C10L1/303; C10L1/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A COMPOUND HAVING THE FORMULA R-M WHEREIN R IS A CYCLOPENTADIENYL HYDROCARBON GROUP AND M IS A GROUP III-A ELEMENT HAVING A ATOMIC NUMBER OF AT LEAST 31, THE ELEMENT M BEING BONDED TO A CYCLOPENTADIENYL RING OF THE CYCLOPENTADIENYL GROUP, SAID CYCLOPENTADIENYL GROUP CONTAINING FROM 5 TO 17 CARBON ATOMS.
Claim 2
Dependent Claim
51 words
A COMPOUND HAVING THE FORMULA R-M WHEREIN R IS A CYCLOPENTADIENYL HYDROCARBON GROUP AND M IS A GROUP III-A ELEMENT HAVING A ATOMIC NUMBER OF AT LEAST 31, THE ELEMENT M BEING BONDED TO A CYCLOPENTADIENYL RING OF THE CYCLOPENTADIENYL GROUP, SAID CYCLOPENTADIENYL GROUP CONTAINING FROM 5 TO 17 CARBON ATOMS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |