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Patent US3778293A successfully refreshed from Google Patents.
US3778293A
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Method of making regenerative heat-exchanger seals
Assignee: British Leyland Truck and Bus Div Ltd
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Filing: 1972-07-17
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Granted: 1973-12-11
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Expires: 1992-07-17
Abstract
Abstract A METHOD OF MANUFACTURING A COUNTERFACE COLD-SIDE SEAL FOR A ROTARY DISC-TYPE MATRIX OF A REGENERATIVE HEATEXCHANGER COMPRISES: FORMING A MIXTURE OF A TEMPERATURE-RESISTANT POLYMER AND A SOLID LUBRICANT AND DEPOSITING THIS MIXTURE ONTO A COUNTERFACE SUPPORT PAD OF THE SEAL BY MEANS OF FLAME OR PLASMA SPRAYING. D R A W I N G
Inventors
- 👤 C Silverstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |