Patent US3225293A successfully refreshed from Google Patents.
US3225293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for inspecting pipe for defects
Assignee: Individual
•
Filing: 1964-02-20
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Granted: 1965-12-21
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Expires: 1984-02-20
Abstract
No abstract record available.
Inventors
- 👤 Fenton M Wood
- 👤 William T Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:06
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN AN APPARATUS FOR INSPECTING PIPE FOR DEFECTS COMPRISING: A HOUSING FOR PASSING AXIALLY THROUGH SAID PIPE, MEANS FOR EFFECTING RELATIVE MOVEMENT OF SAID HOUSING THROUGH SAID PIPE, A MAGNET CENTRALLY POSITIONED IN SAID HOUSING AND HAVING NORTH AND SOUTH POLES, A PAIR OF RESILIENT, EXPANDABLE, MAGNETICALLY PERMEABLE ANNULAR MEMBERS, ONE OF WHICH SURROUNDS EACH OF THE POLES OF SAID MAGNET AND WHICH ARE OF A SIZE TO RESILIENTLY CONTACT THE INSIDE OF SAID PIPE WHEN IN THE EXPANDED CONDITION, WHEREBY A LONGITUDINAL
Claim 2
Dependent Claim
83 words
IN AN APPARATUS FOR INSPECTING PIPE FOR DEFECTS COMPRISING: A HOUSING FOR PASSING AXIALLY THROUGH SAID PIPE, MEANS FOR EFFECTING RELATIVE MOVEMENT OF SAID HOUSING THROUGH SAID PIPE, A MAGNET CENTRALLY POSITIONED IN SAID HOUSING AND HAVING NORTH AND SOUTH POLES, A PAIR OF RESILIENT, EXPANDABLE, MAGNETICALLY PERMEABLE ANNULAR MEMBERS, ONE OF WHICH SURROUNDS EACH OF THE POLES OF SAID MAGNET AND WHICH ARE OF A SIZE TO RESILIENTLY CONTACT THE INSIDE OF SAID PIPE WHEN IN THE EXPANDED CONDITION, WHEREBY A LONGITUDINAL
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |