Patent US3280749A successfully refreshed from Google Patents.
US3280749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumps
Assignee: IMO Industries Inc
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Filing: 1964-11-06
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Granted: 1966-10-25
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Expires: 1984-11-06
Abstract
No abstract record available.
Inventors
- 👤 Morgan B Sennet
- 👤 William J Millard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:21
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F04B43/113; F04B43/1136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PUMP COMPRISING A PAIR OF CHAMBERS HAVING OPENINGS FOR THE INFLOW AND OUTFLOW OF PUMPED LIQUID, PULSATORS WITHIN SAID CHAMBERS SEPARATING SAID CHAMBERS INTO OUTER REGIONS FOR THE RECEPTION OF PUMPED LIQUID AND INNER REGIONS FOR THE RECEPTION OF DRIVING LIQUID, A SOURCE OF DRIVING LIQUID UNDER PRESSURE, MEANS DIRECTING FLOW OF DRIVING LIQUID FROM SAID SOURCE ALTERNATELY INTO EACH OF SAID INNER REGIONS OF SAID PULSATORS EFFECTING ALTERNATE EXPANSIONS THEREOF, AND ADDITIONAL VALVE-CONTROLLED MEANS DIRECTING AN INITIAL VOLUME OF DRIVING LIQUID FROM SAID SOURCE TO THE INNER REGION OF EACH SAID PULSATOR WHEN SAID PULSATOR IS COMPLETELY COLLAPSED AND PRIOR TO MOVEMENT THEREOF, THEREBY TO PREPRESSURIZE SAID PULSATOR PRIOR TO ITS EXPANSION BY SAID DRIVING LIQUID.
Claim 2
Dependent Claim
118 words
A PUMP COMPRISING A PAIR OF CHAMBERS HAVING OPENINGS FOR THE INFLOW AND OUTFLOW OF PUMPED LIQUID, PULSATORS WITHIN SAID CHAMBERS SEPARATING SAID CHAMBERS INTO OUTER REGIONS FOR THE RECEPTION OF PUMPED LIQUID AND INNER REGIONS FOR THE RECEPTION OF DRIVING LIQUID, A SOURCE OF DRIVING LIQUID UNDER PRESSURE, MEANS DIRECTING FLOW OF DRIVING LIQUID FROM SAID SOURCE ALTERNATELY INTO EACH OF SAID INNER REGIONS OF SAID PULSATORS EFFECTING ALTERNATE EXPANSIONS THEREOF, AND ADDITIONAL VALVE-CONTROLLED MEANS DIRECTING AN INITIAL VOLUME OF DRIVING LIQUID FROM SAID SOURCE TO THE INNER REGION OF EACH SAID PULSATOR WHEN SAID PULSATOR IS COMPLETELY COLLAPSED AND PRIOR TO MOVEMENT THEREOF, THEREBY TO PREPRESSURIZE SAID PULSATOR PRIOR TO ITS EXPANSION BY SAID DRIVING LIQUID.
References Cited (Backward Citations)
US2274224A
Cited
US2897762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |