US3717573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of petroleum hydrocarbons from water surfaces
Assignee: Pfizer Inc
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Filing: 1969-06-16
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Granted: 1973-02-20
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Expires: 1989-06-16
Abstract
Abstract A PROCESS FOR REMOVING PETROLEUM HYDROCARBONS FROM THE SURFACE OF FRESH OR SALINE WATER BY DISPERSING MAGNETIC IRON OXIDE IN THE PRESENCE OF WETTING AGENT ON THE SURFACE OF OIL-CONTAMINATED WATER, AND REMOVING OIL-ADSORBED METALLIC PARTICLES BY MEANS OF MAGNETIC ATTRACTION.
Inventors
- 👤 J Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/681
Claims Analysis
Total Claims: 0
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |