Patent US4945317A successfully refreshed from Google Patents.
Patent US3145224A successfully refreshed from Google Patents.
US3145224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of lead compounds
Assignee: Ethyl Corp
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Filing: 1963-02-15
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Granted: 1964-08-18
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Expires: 1983-02-15
Abstract
No abstract record available.
Inventors
- 👤 Richard K Scales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:11
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE MANUFACTURE OF TETRAMETHYLLEAD BY THE CATALYZED REACTION OF MONOSODIUM LEAD ALLOY AND METHYL CHLORIDE, THE IMPROVEMENT CONSISTING OF REACTING IN THE PRESENCE OF A REACTION MEDIUM OF FROM ABOUT 10 TO 25 WEIGHT PERCENT BASED ON THE ALLOY, SAID REACTION MEDIUM INCLUDING AT LEAST 8 PERCENT 1,2-DICHLOROETHANE, AND FROM 0 TO ABOUT 10 WEIGHT PERCENT OF AN INERT LIQUID HYDROCARBON HAVING AN ATMOSPHERIC MID-BOILING POINT OF FROM ABOUT 90 TO 150*C.
Claim 2
Dependent Claim
73 words
IN THE MANUFACTURE OF TETRAMETHYLLEAD BY THE CATALYZED REACTION OF MONOSODIUM LEAD ALLOY AND METHYL CHLORIDE, THE IMPROVEMENT CONSISTING OF REACTING IN THE PRESENCE OF A REACTION MEDIUM OF FROM ABOUT 10 TO 25 WEIGHT PERCENT BASED ON THE ALLOY, SAID REACTION MEDIUM INCLUDING AT LEAST 8 PERCENT 1,2-DICHLOROETHANE, AND FROM 0 TO ABOUT 10 WEIGHT PERCENT OF AN INERT LIQUID HYDROCARBON HAVING AN ATMOSPHERIC MID-BOILING POINT OF FROM ABOUT 90 TO 150*C.
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) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |