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US3539509A
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Method for electromagnetic removal of iron-oxides from liquids
Assignee: Siemens AG
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Filing: 1968-04-30
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Granted: 1970-11-10
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Expires: 1988-04-30
Abstract
No abstract record available.
Inventors
- 👤 Hans-Gunter Heitmann
- 👤 Gerhard Donath
- 👤 Werner Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/48; B; B01; B01D; B01D35/00; B01D35/06; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B03C1/031; B03C1/032; C02F1/488
Claims Analysis
Total Claims: 0
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |