Patent CA613300A successfully refreshed from Google Patents.
US3440256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential batch manufacture of tetramethyl lead
Assignee: EIDP Inc
•
Filing: 1967-04-19
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Granted: 1969-04-22
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Expires: 1987-04-19
Abstract
No abstract record available.
Inventors
- 👤 William W Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:11
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2160177A
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US2863737A
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US3053640A
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US2893845A
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US3006736A
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US3049558A
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US3089843A
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US3048610A
Cited
US3072694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |