US3520176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detection of leaks in vessels
Assignee: ARTHUR PFEIFFER HOCHVAKUUMTECHNIK GMBH
•
Filing: 1968-04-08
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Granted: 1970-07-14
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Expires: 1988-04-08
Abstract
No abstract record available.
Inventors
- 👤 Willi Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:40
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202; F; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/046; G01M3/205
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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |