US3664638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing device
Assignee: National Oilwell Varco LP
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Filing: 1970-02-24
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Granted: 1972-05-23
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Expires: 1990-02-24
Abstract
Abstract A DEVICE FOR THROUGHLY MIXING COMPONENTS OF A FLUIDIC MATERIAL FLOWING THROUGH A CONDUIT WHICH CONTAINS A PLURALITY OF CURVED SHEET-LIKE ELEMENTS EXTENDING LONGITUDINALLY THROUGH THE CONDUIT IN WHICH CONSECUTIVE ELEMENTS ARE CURVED IN OPPOSITE DIRECTIONS AND THE ADJACENT EDGES OF CONSECUTIVE ELEMENTS ARE SPACED FROM EACH OTHER BY A DISTANCE DEPENDENT ON THE REYNOLDS NUMBER OF THE FLUID AND ANGULARLY DISPLACED WITH RESPECT TO EACH OTHER BY AN ANGLE WHICH DIFFERS FROM 90* BY AN AMOUNT DEPENDENT ON SAID DISTANCE.
Inventors
- 👤 Kenneth M Grout
- 👤 Richard D Devellian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:24
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4314; B01F25/43141; B01F25/4315; B01F25/43151; F; F28; F28F; F28F13/00; F28F13/06; F28F13/12; A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M2025/0073
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |