US3626770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-up seal for bellows
Assignee: ABB Inc USA
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Filing: 1970-01-30
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Granted: 1971-12-14
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Expires: 1990-01-30
Abstract
Abstract A BELLOWS IS ATTACHED TO A MOVABLE SHAFT WHICH EXTENDS THROUGH A BARRIER BETWEEN A HIGH-PRESSURE AND LOW-PRESSURE REGION. THE BELLOWS FORMS A SEAL BETWEEN THE OUTER DIAMETER OF THE SHAFT AND THE OPENING IN THE BARRIER THROUGH WHICH THE SHAFT PASSES. A SEALING RING FORMED AROUND THE SHAFT THEN FORMS A SECOND SEAL BETWEEN THE BELLOWS INTERIOR AND THE SHAFT. A MONITORING CHANNEL IS CONNECTED TO THE VOLUME BOUNDED BETWEEN THE BACK-UP SEAL AND THE BELLOWS INTERIOR.
Inventors
- 👤 Roy W Lindberg
- 👤 James R Mccloud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:10
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/50; F16J15/52; F16J15/56
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |