US3536617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for neutralizing and cleaning an acid solution containing an oil
Assignee: ETHYL CORP OF CANADA Ltd
•
Filing: 1969-03-10
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Granted: 1970-10-27
•
Expires: 1989-03-10
Abstract
No abstract record available.
Inventors
- 👤 John M Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:30
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/66; C02F2101/00; C02F2101/30; C02F2101/36; C02F2101/363
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1226333A
Cited
US1426596A
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US1430182A
Cited
US2389739A
Cited
US2876863A
Cited
GB955321A
Cited
US3301779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |