US3253149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for hardness testing using backscattered beta radiation
Assignee: Jones and Laughlin Steel Corp
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Filing: 1962-08-16
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Granted: 1966-05-24
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Expires: 1982-08-16
Abstract
No abstract record available.
Inventors
- 👤 Walter A Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:23
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN APPARATUS FOR MEASURING THE HARDNESS OF A METALLIC WORKPIECE INCLUDING MEANS FOR BOMBARDING THE SURFACE OF THE WORKPIECE WITH BETA RAYS OF SUCH NATURE THAT THE WORKPIECE PRESENTS AN INFINITE THICKNESS TO THE RAYS, MEANS SPACED FROM THE WORKPIECE FOR DETECTING THE BACKSCATTER RESULTING FROM SUCH BOMBARDMENT, AND MEANS FOR CONVERTING THE DETECTED BACKSCATTER INTO AN INDICATION OF THE HARDNESS OF SAID WORKPIECE; THE IMPROVEMENT OF MEANS FOR MAINTAINING THE DENSITY OF THE AIR BETWEEN THE SURFACE OF THE WORKPIECE AND SAID DETECTING MEANS CONSTANT COMPRISING A DEVICE FOR BLOWING A CONSTANT STREAM OF AIR INTO THE SPACE BETWEEN THE SURFACE OF THE WORKPIECE AND SAID DETECTING MEANS, AND APPARATUS INCLUDING A TEMPERTURE MEASURING DEVICE IN SAID STREAM OF AIR FOR MAINTIANING THE TEMPERATURE OF THE STEAM OF AIR CONSTANT.
Claim 2
Dependent Claim
131 words
IN APPARATUS FOR MEASURING THE HARDNESS OF A METALLIC WORKPIECE INCLUDING MEANS FOR BOMBARDING THE SURFACE OF THE WORKPIECE WITH BETA RAYS OF SUCH NATURE THAT THE WORKPIECE PRESENTS AN INFINITE THICKNESS TO THE RAYS, MEANS SPACED FROM THE WORKPIECE FOR DETECTING THE BACKSCATTER RESULTING FROM SUCH BOMBARDMENT, AND MEANS FOR CONVERTING THE DETECTED BACKSCATTER INTO AN INDICATION OF THE HARDNESS OF SAID WORKPIECE; THE IMPROVEMENT OF MEANS FOR MAINTAINING THE DENSITY OF THE AIR BETWEEN THE SURFACE OF THE WORKPIECE AND SAID DETECTING MEANS CONSTANT COMPRISING A DEVICE FOR BLOWING A CONSTANT STREAM OF AIR INTO THE SPACE BETWEEN THE SURFACE OF THE WORKPIECE AND SAID DETECTING MEANS, AND APPARATUS INCLUDING A TEMPERTURE MEASURING DEVICE IN SAID STREAM OF AIR FOR MAINTIANING THE TEMPERATURE OF THE STEAM OF AIR CONSTANT.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |