Patent US3425264A successfully refreshed from Google Patents.
US3425264A
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Method and apparatus for detecting a leak in a heat exchanger
Assignee: Sulzer AG
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Filing: 1966-09-27
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Granted: 1969-02-04
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Expires: 1986-09-27
Abstract
No abstract record available.
Inventors
- 👤 Hans Frei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:30
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/421; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/226; G01M3/228; G21; G21C; G21C17/00; G21C17/002; F16; F16L; F16L2101/00; F16L2101/30; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 0
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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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |