US2740730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing valve parts for apparatus for handling molten calcium
Assignee: Metal Hydrides Inc
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Filing: 1953-12-02
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Granted: 1956-04-03
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Expires: 1973-12-02
Abstract
No abstract record available.
Inventors
- 👤 Mario D Banus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:28
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; F; F16; F16K; F16K25/00; F16K25/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12729
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD FOR PREPARING VALVE MEANS FOR AN APPARATUS FOR HANDLING MOLTEN CALCIUM AT A PREDETERMINED TEMPERATURE, SAID VALVE MEANS INCLUDING A VALVE SEAT AND A VALVE PLUG MOVEABLE INTO AND OUT OF ENGAGEMENT WITH THE SEAT, SAID SEAT AND PLUG BEING FORMED OF AN ALLOY HAVING GOOD CORROSION RESISTANCE AT HIGH TEMPERATURE, SAID METHOD COMPRISING PRETREATING AT LEAST ONE OF THE VALVE PARTS CONSISTING OF SAID SEAT AND PLUG BY SUBJECTING IT TO THE ACTION OF MOLTEN CALCIUM METAL AT A TEMPERATURE BELOW THAT AT WHICH THE ALLOY IS SUBSTANTIALLY CORRODED BUT GREATER THAN SAID PREDETERMINED TEMPERATURE FOR A SUFFICIENT PERIOD OF TIME TO CAUSE SUBSTANTIAL DIFFUSION OF CALCIUM METAL INTO THE SURFACE THEREOF WHICH IS TO ENGAGE THE OTHER VALVE PART.
Claim 2
Independent Claim
123 words
A METHOD FOR PREPARING VALVE MEANS FOR AN APPARATUS FOR HANDLING MOLTEN CALCIUM AT A PREDETERMINED TEMPERATURE, SAID VALVE MEANS INCLUDING A VALVE SEAT AND A VALVE PLUG MOVEABLE INTO AND OUT OF ENGAGEMENT WITH THE SEAT, SAID SEAT AND PLUG BEING FORMED OF AN ALLOY HAVING GOOD CORROSION RESISTANCE AT HIGH TEMPERATURE, SAID METHOD COMPRISING PRETREATING AT LEAST ONE OF THE VALVE PARTS CONSISTING OF SAID SEAT AND PLUG BY SUBJECTING IT TO THE ACTION OF MOLTEN CALCIUM METAL AT A TEMPERATURE BELOW THAT AT WHICH THE ALLOY IS SUBSTANTIALLY CORRODED BUT GREATER THAN SAID PREDETERMINED TEMPERATURE FOR A SUFFICIENT PERIOD OF TIME TO CAUSE SUBSTANTIAL DIFFUSION OF CALCIUM METAL INTO THE SURFACE THEREOF WHICH IS TO ENGAGE THE OTHER VALVE PART.
References Cited (Backward Citations)
US2400255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |