US3091469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1959-03-04
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Granted: 1963-05-28
•
Expires: 1979-03-04
Abstract
No abstract record available.
Inventors
- 👤 Richard J Matt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:18
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/42; Y; Y10; Y10S; Y10S277/00; Y10S277/93; Y10S277/931; Y10S277/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF PREVENTING LEAKAGE PAST A LIQUID SEAL INCLUDING AN ANNULAR SEALING CHAMBER SURROUNDING A ROTATING SHAFT AND RECEIVING AN ANNULAR IMPELLER ATTACHED TO THE SHAFT FOR FORCING LIQUID OUTWARDLY IN THE CHAMBER TO FORM A PRESSURE SEAL, THE METHOD COMPRISING THE STEPS OF PROVIDING A FLUID BACKING FOR THE LIQUID IN THE CHAMBER DURING RELATIVELY SLOW ROTATIONAL SPEEDS OF THE ROTARY MEMBER ADEQUATE TO PROVIDE SUFFICIENT SEALING PRESSURE IN THE LIQUID AND SOLIDIFYING THE LIQUID DURING PERIODS OF NON-ROTATION OF THE ROTARY MEMBER.
Claim 2
Independent Claim
85 words
THE METHOD OF PREVENTING LEAKAGE PAST A LIQUID SEAL INCLUDING AN ANNULAR SEALING CHAMBER SURROUNDING A ROTATING SHAFT AND RECEIVING AN ANNULAR IMPELLER ATTACHED TO THE SHAFT FOR FORCING LIQUID OUTWARDLY IN THE CHAMBER TO FORM A PRESSURE SEAL, THE METHOD COMPRISING THE STEPS OF PROVIDING A FLUID BACKING FOR THE LIQUID IN THE CHAMBER DURING RELATIVELY SLOW ROTATIONAL SPEEDS OF THE ROTARY MEMBER ADEQUATE TO PROVIDE SUFFICIENT SEALING PRESSURE IN THE LIQUID AND SOLIDIFYING THE LIQUID DURING PERIODS OF NON-ROTATION OF THE ROTARY MEMBER.
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US2145123A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |