US3558246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump for viscous fluids
Assignee: Eisenwerke Kaiserslautern GmbH
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Filing: 1968-12-23
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Granted: 1971-01-26
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Expires: 1988-12-23
Abstract
Abstract A ROTARY ROOT''S TYPE PUMP FOR CONVEYING VISCOUS FLUIDS WITH CORROSIVE PROPERTIES IN WHICH EACH OF TWO ROTORS HAS A BODY OF METAL TO WHICH STRIPS OF A NON-CORROSIVE AND WEAR-RESISTANT PLASTIC ARE REMOVABLY SECURED WHICH FORM AT LEAST THE OUTWARDLY PROJECTING ROTOR HEADS WHICH ARE SLIDABLE ALONG THE INNER WALL OF THE PUMP HOUSING WHICH IS PROVIDED WITH A COATING OF ENAMEL AND ALONG THE CORE OR THE REDUCED PARTS BETWEEN THE HEADS OF THE OTHER ROTOR.
Inventors
- 👤 Rudi Philipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:34
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/126; F04C2/082; F04C2/084; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/126; F05; F05C; F05C2225/00; F05C2225/04
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |