Patent US3672791A successfully refreshed from Google Patents.
US3672791A
Expired / Lapsed
US
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Pumping system with controlled liquid addition
Assignee: ATI Ladish Co Inc
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Filing: 1970-07-17
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Granted: 1972-06-27
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Expires: 1990-07-17
Abstract
Abstract LIQUIDS WHICH ARE TO BE ADDED IN PRECISE AMOUNTS TO THE SUCTION SIDE OF A MAIN PUMP IN A LIQUID SYSTEM ARE PUMPED FROM AN ADDITIVE TANK BY A SPECIAL DIAPHRAGM PUMP WHICH IS SO CONSTRUCTED AND ARRANGED THAT THE DIAPHRAGM SERVES AS A NORMALLY-CLOSED, POSITIVE SHUT-OFF VALVE WHEN THE DIAPHRAGM PUMP IS NOT OPERATING TO PREVENT EXCESS CHEMICAL FROM BEING SUCKED INTO THE SYSTEM.
Inventors
- 👤 Robert D Zimmerly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:17
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/073; F04B43/0009; F04B43/0054; F04B9/00; F04B9/08; F04B9/12; F04B9/123; F04B9/1235
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |