US3554661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature pump
Assignee: BURKS PUMPS INC A CORP OF DE
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Filing: 1968-12-20
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Granted: 1971-01-12
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Expires: 1988-12-20
Abstract
Abstract A RESTRICTED PASSAGEWAY BETWEEN AN IMPELLER CAVITY AREA AND A SHAFT SEAL CAVITY AREA IN A HIGH TEMPERATURE PUMP ALLOWS A PORTION OF THE HIGH TEMPERATURE PUMPED FLUID TO BE CIRCULATED TO THE SHAFT SEAL CAVITY AREA. A COOLING JACKET MEANS LOCATED ADJACENT THE PASSAGEWAY CIRCULATES A DIFFERENT COOLED FLUID TO COOL THE PORTION OF THE HIGH TEMPERATURE FLUID THAT PASSES THROUGH SAID RESTRICTED PASSAGEWAY TO SAID SHAFT SEAL CAVITY AREA. COOL TEMPERATURES IN THE SHAFT SEAL CAVITY AREA ALLOW THE USE OF A SIMPLE AND INEXPENSIVE SHAFT SEALING MEANS.
Inventors
- 👤 Paul L Oglesby
- 👤 Richard E Reeves
- 👤 William K Haebich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:28
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F04D29/128; F04D29/58; F04D29/586; F04D29/588; F04D5/00; F04D5/002
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |