Patent US3556697A successfully refreshed from Google Patents.
US3556697A
Expired / Lapsed
US
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Sealing arrangement for vacuum pump
Assignee: Ingersoll Rand Co
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Filing: 1969-04-10
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Granted: 1971-01-19
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Expires: 1989-04-10
Abstract
Abstract A SEALING ARRANGEMENT FOR A VACUUM PUMP HAVING THE END PORTIONS OF THE SHAFT EXTENDING THROUGH THE END WALLS OF A PUMP HOUSING, EACH SHAFT END PORTION PROVIDED WITH SPACED LABYRINTH SEALS, AND A CONDUIT TO CONDUCT SEALING LIQUID BETWEEN THE SEALS OF EACH SHAFT END PORTION. THE SUBATMOSPHERIC PRESSURE PRODUCED AT BOTH SHAFT END PORTIONS DRAWS SEALING LIQUID THROUGH THE ASSOCIATED SEALS INTO THE PUMP HOUSING. THE SUBATMOSPHERIC PRESSURE IN AN INTERMEDIATE PORTION OF THE PUMP HOUSING IS ALSO UTILIZED TO DRAW SEALING LIQUID THROUGH THE SEALS AND INTO THE PUMP HOUSING.
Inventors
- 👤 Paul D Webb
- 👤 David C Lasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:45
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/008; F04C27/009
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |