Pump
Abstract
Abstract A PUMP IMPELLER, ESPECIALLY USEFUL IN THE PUMPING OF CORROSIVE AND ABRASIVE LIQUIDS, INCLUDES A UNITARY BLADESHAFT MEMBER OF A MATERIAL SUCH AS A CORROSION RESISTANT VITREOUS OR CERAMIC MATERIAL, WHICH IS IMPARCTICALBE FOR THREADING OR OTHER SUCH SHAPING OPERATIONS OR HAS INSUFFICIENT STRENGTH TO WITHSTAND NORMAL FORCES ON THREADS OR OTHER SUCH ELEMENTS THEREOF. TO PROVIDE FOR AFFIXATION TO MEANS FOR ROTATING THE IMPELLER IN A PUMP, A THREADABLE SHAFT EXTENSION IS EMPLOYED, INSERTED INTO AND CEMENTED IN PLACE IN A HOLLOW PORTION OF THE BLADE-SHAFT MEMBER AND THREADED OR OTHERWISE FORMED OR MACHINED AT ITS OTHER END FOR CONNECTION WITH SUITABLE DRIVING MEANS. BY MAKING THE BLADE-SHAFT MEMBER SO THAT CORROSION-RESISTANT SHAFT PORTION IS LONG ENOUGH TO EXTEND PAST A SEAL, CONTACT OF THE PUMPED LIQUID WITH THE IMPELLER IS LIMITED TO THE CORROSION-RESISTANT PART THEREOF. ALSO DISCLOSED ARE PUMPS AND MOTOR-PUMP COMBINATIONS INCLUDING THE MENTIONED IMPELLERS, AS WELL AS METHODS FOR THE MANUFACTURE OF THE IMPELLERS.
Inventors
- 👤 Robert H Bevan
- 👤 Vincent D Buffone
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |