US2997760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continous vaccum casting process
Assignee: Stauffer Chemical Co
•
Filing: 1957-06-10
•
Granted: 1961-08-29
•
Expires: 1977-06-10
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hanks
- 👤 Charles D A Hunt
- 👤 Jr Hugh R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/228; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A CONTINUOUS PROCESS FOR MAKING DEVOLATILIZED METAL CASTINGS WITHIN VACUUM APPARATUS INCLUDING A CRUCIBLE AND A VACUUM CHAMBER, SAID CRUCIBLE BEING PROVIDED WITH AN APERTURE OPENING INTO SAID VACUUM CHAMBER FOR WITHDRAWING MOLTEN METAL FROM THE CRUCIBLE, COMPRISING THE FOLLOWING CONTEMPORANEOUS STEPS: MAINTAINING A PARTIAL VACUUM WITHIN SAID CRUCIBLE AT AN ABSOLUTE PRESSURE BETWEEN TEN MICRONS AND ONE MILLIMETER OF MERCURY, CONTINUALLY FEEDING INTO SAID CRUCIBLE METAL INITIALLY CONTAINING A SUBSTANTIAL AMOUNT OF VOLATILE MATTER, CONTINUALLY HEATING SAID METAL WITHIN SAID CRUCIBLE TO THE MELTING TEMPERATURE OF SAID METAL, SO THAT SAID METAL CONTINUALLY EVOLVES A PORTION OF SAID VOLATILE MATTER INTO SAID PARTIAL VACUUM TO PRODUCE PARTLY DEVOLATILIZED MOLTEN METAL CONTINUALLY WITHIN SAID CRUCIBLE, MAINTAINING WITHIN SAID VACUUM CHAMBER A HIGH VACUUM AT AN ABSOLUTE PRESSURE OF LESS THAN ONE MICRON OF MERCURY, CONTINUALLY TRANSFERRING SAID PARTLY DEVOLATILIZED MOLTEN METAL THROUGH SAID APERTURE INTO AN OPEN-TOPPED MOLD DISPOSED DIRECTLY BELOW SAID APERTURE AND WITHIN SAID VACUUM CHAMBER, SUPPLYING ADDITIONAL HEAT TO SAID METAL WITHIN SAID VACUUM CHAMBER BY DIRECT ELECTRON BOMBARDMENT OF THE UPPER SURFACE OF MOLTEN METAL WITHIN SAID
Claim 2
Dependent Claim
181 words
A CONTINUOUS PROCESS FOR MAKING DEVOLATILIZED METAL CASTINGS WITHIN VACUUM APPARATUS INCLUDING A CRUCIBLE AND A VACUUM CHAMBER, SAID CRUCIBLE BEING PROVIDED WITH AN APERTURE OPENING INTO SAID VACUUM CHAMBER FOR WITHDRAWING MOLTEN METAL FROM THE CRUCIBLE, COMPRISING THE FOLLOWING CONTEMPORANEOUS STEPS: MAINTAINING A PARTIAL VACUUM WITHIN SAID CRUCIBLE AT AN ABSOLUTE PRESSURE BETWEEN TEN MICRONS AND ONE MILLIMETER OF MERCURY, CONTINUALLY FEEDING INTO SAID CRUCIBLE METAL INITIALLY CONTAINING A SUBSTANTIAL AMOUNT OF VOLATILE MATTER, CONTINUALLY HEATING SAID METAL WITHIN SAID CRUCIBLE TO THE MELTING TEMPERATURE OF SAID METAL, SO THAT SAID METAL CONTINUALLY EVOLVES A PORTION OF SAID VOLATILE MATTER INTO SAID PARTIAL VACUUM TO PRODUCE PARTLY DEVOLATILIZED MOLTEN METAL CONTINUALLY WITHIN SAID CRUCIBLE, MAINTAINING WITHIN SAID VACUUM CHAMBER A HIGH VACUUM AT AN ABSOLUTE PRESSURE OF LESS THAN ONE MICRON OF MERCURY, CONTINUALLY TRANSFERRING SAID PARTLY DEVOLATILIZED MOLTEN METAL THROUGH SAID APERTURE INTO AN OPEN-TOPPED MOLD DISPOSED DIRECTLY BELOW SAID APERTURE AND WITHIN SAID VACUUM CHAMBER, SUPPLYING ADDITIONAL HEAT TO SAID METAL WITHIN SAID VACUUM CHAMBER BY DIRECT ELECTRON BOMBARDMENT OF THE UPPER SURFACE OF MOLTEN METAL WITHIN SAID
References Cited (Backward Citations)
GB413743A
Cited
US2423729A
Cited
US2554902A
Cited
US2625719A
Cited
US2771568A
Cited
US2709842A
Cited
US2778926A
Cited
GB735642A
Cited
US2688169A
Cited
US2858199A
Cited
US2804664A
Cited
US2882570A
Cited
US2880483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |