Patent US3424437A successfully refreshed from Google Patents.
US3424437A
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US
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Apparatus for mixing viscous fluids
Assignee: Shell USA Inc
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Filing: 1967-08-28
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Granted: 1969-01-28
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 Charles J Shearer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:09
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/40; B01F23/47; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4313; B01F25/4314; B01F25/4319; B01F25/432; B01F25/4321
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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |