Patent US3359909A successfully refreshed from Google Patents.
US3359909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump surge chamber and secondary liquid feeder
Assignee: John E Mitchell Co
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Filing: 1965-06-10
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Granted: 1967-12-26
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Expires: 1985-06-10
Abstract
No abstract record available.
Inventors
- 👤 Russell L Johnson
- 👤 John D Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/80; B01F35/88; B01F35/882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A LIQUID MIXING SYSTEM INCLUDING A PRIMARY PUMP AND A SECONDARY PUMP, THE PRIMARY PUMP BEING OF GREATER CAPACITY THAN THE SECONDARY PUMP, THE SECONDARY PUMP COMPRISING A SURGE CHAMBER AND SECONDARY LIQUID FEEDER INCLUDING A HOUSING, A PUMPING CHAMBER WITHIN THE HOUSING, A SPRING CHAMBER WITHIN THE HOUSING, AN INLET OPENING TO THE PUMPING CHAMBER, A WALL RECIPROCABLE WITHIN THE PUMPING CHAMBER, MEANS PROVIDING A LIQUID SEAL TO BLOCK THE FLOW OF LIQUID PAST THE RECIPROCABLE WALL AND TO THEREBY BLOCK LIQUID COMMUNICATION BETWEEN THE PUMPING CHAMBER AND THE SPRING CHAMBER, A COMPRESSION SPRING WITHIN THE SPRING CHAMBER BIASING THE WALL IN A DIRECTION TENDING TO REDUCE THE VOLUME OF THE PUMPING CHAMBER, THE PRIMARY PUMP BEING A PULSATING PUMP HAVING AN INLET AND AN OUTLET, MEANS TO CONNECT THE PULSATING PUMP INLET TO A SOURCE OF PRIMARY LIQUID THEREBY CAUSING THE PRIMARY LIQUID TO BE PUMPED FROM THE INLET TO THE OUTLET OF THE PULSATING PUMP, MEANS FOR CONNECTING THE INLET OPENING OF
Claim 2
Dependent Claim
165 words
A LIQUID MIXING SYSTEM INCLUDING A PRIMARY PUMP AND A SECONDARY PUMP, THE PRIMARY PUMP BEING OF GREATER CAPACITY THAN THE SECONDARY PUMP, THE SECONDARY PUMP COMPRISING A SURGE CHAMBER AND SECONDARY LIQUID FEEDER INCLUDING A HOUSING, A PUMPING CHAMBER WITHIN THE HOUSING, A SPRING CHAMBER WITHIN THE HOUSING, AN INLET OPENING TO THE PUMPING CHAMBER, A WALL RECIPROCABLE WITHIN THE PUMPING CHAMBER, MEANS PROVIDING A LIQUID SEAL TO BLOCK THE FLOW OF LIQUID PAST THE RECIPROCABLE WALL AND TO THEREBY BLOCK LIQUID COMMUNICATION BETWEEN THE PUMPING CHAMBER AND THE SPRING CHAMBER, A COMPRESSION SPRING WITHIN THE SPRING CHAMBER BIASING THE WALL IN A DIRECTION TENDING TO REDUCE THE VOLUME OF THE PUMPING CHAMBER, THE PRIMARY PUMP BEING A PULSATING PUMP HAVING AN INLET AND AN OUTLET, MEANS TO CONNECT THE PULSATING PUMP INLET TO A SOURCE OF PRIMARY LIQUID THEREBY CAUSING THE PRIMARY LIQUID TO BE PUMPED FROM THE INLET TO THE OUTLET OF THE PULSATING PUMP, MEANS FOR CONNECTING THE INLET OPENING OF
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |