US3522008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger leak detection
Assignee: Phillips Petroleum Co
•
Filing: 1967-10-13
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Granted: 1970-07-28
•
Expires: 1987-10-13
Abstract
No abstract record available.
Inventors
- 👤 Charles E Defabaugh
- 👤 George R Hettick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:08
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/226; G01M3/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3087064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |