US3085423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak detection
Assignee: Airco Inc
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Filing: 1958-10-28
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Granted: 1963-04-16
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Expires: 1978-10-28
Abstract
No abstract record available.
Inventors
- 👤 Ward M Champion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
IN A METHOD OF DETECTING LEAKS IN AN UNDERGROUND VESSEL, THE STEPS OF INTRODUCING INTO THE VESSEL A NONCORROSIVE, NONTOXIC, ESSENTIALLY LIQUID COMPOSITION COMPRISING WATER AND NITROUS OXIDE DISSOLVED HEREIN, MAINTAINING THE PRESSURE OF THE LIQUID COMPOSITION IN THE VESSEL AT A PRESSURE SUBSTANTIALLY ABOVE ATMOSPHERIC PRESSURE AND ANALYZING THE ATMOSPHERE AT ABOUT THE SURFACE OF THE GROUND AND ABOVE TH VESSEL FOR THE PRESENCE OF NITROUS
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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |