Patent US3439837A successfully refreshed from Google Patents.
US3439837A
Expired / Lapsed
US
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Leak detecting system and method
Assignee: Symington Wayne Corp
•
Filing: 1967-07-18
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Granted: 1969-04-22
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Expires: 1987-07-18
Abstract
No abstract record available.
Inventors
- 👤 Robert T Hearn
- 👤 Robert M Riordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2892; F; F16; F16L; F16L2101/00; F16L2101/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2534158A
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US2961868A
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US2952387A
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US2936611A
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US3100986A
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US3183723A
Cited
US3273753A
Cited
US3360982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |