Patent US3081975A successfully refreshed from Google Patents.
US3081975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seals for turbines and pumps
Assignee: Library and Archives Canada
•
Filing: 1959-03-26
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Granted: 1963-03-19
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Expires: 1979-03-26
Abstract
No abstract record available.
Inventors
- 👤 Sproule Robert Stanley
- 👤 Jacques A Desbaillets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:09
CPC Classifications
F; F03; F03B; F03B11/00; F03B11/006; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
IN A TURBINE INCLUDING A RUNNER MEMBER HAVING RUNNER BLADES AND A STATIONARY MEMBER, THE SPACE BETWEEN SAID STATIONARY MEMBER AND SAID RUNNER MEMBER HAVING AN ANNULAR AREA OF RESTRICTED CLEARANCE UPSTREAM OF THE RUNNER BLADES AND AN ANNULAR AREA OF ENLARGED CLEARANCE ON THE DOWNSTREAM SIDE OF THE AREA OF RESTRICTED CLEARANCE, IN COMBINATION, MEANS FOR SEALING THE ANNULAR AREA OF RESTRICTED CLEARANCE BETWEEN THE STATIONARY MEMBER AND RUNNER MEMBER, A BAFFLE DIVIDING THE AREA OF ENLARGED CLEARANCE INTO TWO COMPARTMENTS COMPRISING AN INNER COMPARTMENT BETWEEN THE RUNNER MEMBER AND ONE SIDE OF SAID BAFFLE AND AN OUTER COMPARTMENT ON THE OPPOSITE SIDE OF THE BAFFLE, EACH OF SAID COMPARTMENTS HAVING AT LEAST ONE OPEN END AND BEING IN COMMUNICATION WITH SAID AREA OF RESTRICTED CLEARANCE, MEANS FOR SUPPLYING AIR UNDER PRESSURE TO SAID INNER COMPARTMENT WHEREBY WATER LEAKING PAST SAID SEALING MEANS IS DIRECTED TO THE OUTER COMPARTMENT THUS MINIMIZING FRICTIONAL LOSSES BETWEEN THE RUNNER MEMBER AND THE LEAKAGE WATER, AND OUTLETS FROM SAID OUTER COMPARTMENT TO DISCHARGE THE LEAKAGE WATER DOWNSTREAM OF THE TURBINE BLADES.
Claim 2
Dependent Claim
178 words
IN A TURBINE INCLUDING A RUNNER MEMBER HAVING RUNNER BLADES AND A STATIONARY MEMBER, THE SPACE BETWEEN SAID STATIONARY MEMBER AND SAID RUNNER MEMBER HAVING AN ANNULAR AREA OF RESTRICTED CLEARANCE UPSTREAM OF THE RUNNER BLADES AND AN ANNULAR AREA OF ENLARGED CLEARANCE ON THE DOWNSTREAM SIDE OF THE AREA OF RESTRICTED CLEARANCE, IN COMBINATION, MEANS FOR SEALING THE ANNULAR AREA OF RESTRICTED CLEARANCE BETWEEN THE STATIONARY MEMBER AND RUNNER MEMBER, A BAFFLE DIVIDING THE AREA OF ENLARGED CLEARANCE INTO TWO COMPARTMENTS COMPRISING AN INNER COMPARTMENT BETWEEN THE RUNNER MEMBER AND ONE SIDE OF SAID BAFFLE AND AN OUTER COMPARTMENT ON THE OPPOSITE SIDE OF THE BAFFLE, EACH OF SAID COMPARTMENTS HAVING AT LEAST ONE OPEN END AND BEING IN COMMUNICATION WITH SAID AREA OF RESTRICTED CLEARANCE, MEANS FOR SUPPLYING AIR UNDER PRESSURE TO SAID INNER COMPARTMENT WHEREBY WATER LEAKING PAST SAID SEALING MEANS IS DIRECTED TO THE OUTER COMPARTMENT THUS MINIMIZING FRICTIONAL LOSSES BETWEEN THE RUNNER MEMBER AND THE LEAKAGE WATER, AND OUTLETS FROM SAID OUTER COMPARTMENT TO DISCHARGE THE LEAKAGE WATER DOWNSTREAM OF THE TURBINE BLADES.
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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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |