US3730538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbing seal for a rotary regenerative heat exchanger
Assignee: Leyland Gas Turbines Ltd
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Filing: 1971-06-01
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Granted: 1973-05-01
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Expires: 1991-06-01
Abstract
Abstract A rubbing seal for engagement with a hot face of a matrix of a rotary regenerative heat exchanger. The seal comprises a ferritic steel base member, a rubbing surface layer including nickel oxide and an intermediate bonding layer of a nickel aluminum compound between the base member and the rubbing surface layer.
Inventors
- 👤 C Silverstone
- 👤 A Surrall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:13
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; F28; F28D; F28D19/00; F28D19/04; F28D19/047; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939; Y10S277/94; Y10S277/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12083
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
29 words
A seal as claimed in claim 1 in which there is an intermediate bonding layer of a nickel aluminum compound between the base member and the rubbing surface layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |