US3216072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die casting method and apparatus
Assignee: NL Industries Inc
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Filing: 1961-12-13
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Granted: 1965-11-09
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Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Alfred F Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:34
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/101; B22D; B22D17/00; B22D19/00; B22D19/0009
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A METHOD OF DIE CASTING COMPRISING ASSEMBLING A PLURALITY OF SEPARABLE AND RE-UNSABLE CORE PARTS, APPLYING A THIN COATING COMPRISING A MIXTURE OF METAL AND METAL OXIDES OVER SELECTED AREAS OF THE ASSEMBLY OF CORE PARTS INCLUDING AT LEAST SOME OF THE JOINING LINES BETWEEN THE CORE PARTS SAID COATING HAVING A THICKNESS AT LEAST SUFFICIENT TO HOLD SAID CORE PARTS IN ASSEMBLED RELATION PRIOR TO INSERTION INTO A DIE AND TO MAINTAIN ITS INTEGRITY DURING A SUBSEQUENT CASTING OPERATION, INSERTING THE COATED ASSEMBLY AS A UNITARY CORE PIECE INTO A DIE CASTING DIE WITH THE COATED SURFACE EXPOSED TO THE DIE CAVITY, CASTING METAL INTO THE DIE CAVITY UNDER HIGH PRESSURE TO CAUSE THE CASTING METAL TO BOND TO THE COATING WITH A BOND STRENGTH HIGHER THAN THE STRENGTH OF THE ADHERING FORCE BETWEEN THE COATING AND THE ASSEMBLY OF CORE PARTS, EJECTING THE CASTING, AND FINALLY REMOVING THE CORE PARTS LEAVING THE COATING MATERIAL ADHERED TO THE CASTING.
Claim 2
Independent Claim
160 words
A METHOD OF DIE CASTING COMPRISING ASSEMBLING A PLURALITY OF SEPARABLE AND RE-UNSABLE CORE PARTS, APPLYING A THIN COATING COMPRISING A MIXTURE OF METAL AND METAL OXIDES OVER SELECTED AREAS OF THE ASSEMBLY OF CORE PARTS INCLUDING AT LEAST SOME OF THE JOINING LINES BETWEEN THE CORE PARTS SAID COATING HAVING A THICKNESS AT LEAST SUFFICIENT TO HOLD SAID CORE PARTS IN ASSEMBLED RELATION PRIOR TO INSERTION INTO A DIE AND TO MAINTAIN ITS INTEGRITY DURING A SUBSEQUENT CASTING OPERATION, INSERTING THE COATED ASSEMBLY AS A UNITARY CORE PIECE INTO A DIE CASTING DIE WITH THE COATED SURFACE EXPOSED TO THE DIE CAVITY, CASTING METAL INTO THE DIE CAVITY UNDER HIGH PRESSURE TO CAUSE THE CASTING METAL TO BOND TO THE COATING WITH A BOND STRENGTH HIGHER THAN THE STRENGTH OF THE ADHERING FORCE BETWEEN THE COATING AND THE ASSEMBLY OF CORE PARTS, EJECTING THE CASTING, AND FINALLY REMOVING THE CORE PARTS LEAVING THE COATING MATERIAL ADHERED TO THE CASTING.
Claim 3
Dependent Claim
120 words
CORE APPARATUS FOR MAKING HIGH PRESSURE DIE CASTING COMPRISING, THE COMBINATION OF A PLURALITY OF SEPARAABLE AND RE-USABLE CORE ELEMENTS WHICH WHEN RELATED DEFINE AT LEAST A PART OF DIE CAVITY, AND AN INTEGRAL, CONTINUOUS PROTECTIVE METALLIC COAT SURROUNDING SAID SEPARABLE CORE ELEMENTS AND COVERING AT LEAST THE MAJORITY OF AL TIMES OF SEPARATION THEREBETWEEN, SAID COAT BEING INTERPOSED BETWEEN SAID CORE ELEMENTS AND THE REMAINDER OF THE DIE CAVITY FOR CONTACT WITH MOLTEN METAL TO BE INJECTED INTO SAID DIE CAVITY AND SAID COATING HAVIN AN EXPOSED SURFACE OF SUCH ROUGH, IRREGULAR AND POROUS NATURE AS TO BE REMOVED FROM SAID CORE ELEMENT AND ADHERED TO THE DIE CASTING FROM COMPLETION OF CASTING AND WITHDRAWAL OF SAID CORE ELEMENTS.
Claim 4
Dependent Claim
120 words
CORE APPARATUS FOR MAKING HIGH PRESSURE DIE CASTING COMPRISING, THE COMBINATION OF A PLURALITY OF SEPARAABLE AND RE-USABLE CORE ELEMENTS WHICH WHEN RELATED DEFINE AT LEAST A PART OF DIE CAVITY, AND AN INTEGRAL, CONTINUOUS PROTECTIVE METALLIC COAT SURROUNDING SAID SEPARABLE CORE ELEMENTS AND COVERING AT LEAST THE MAJORITY OF AL TIMES OF SEPARATION THEREBETWEEN, SAID COAT BEING INTERPOSED BETWEEN SAID CORE ELEMENTS AND THE REMAINDER OF THE DIE CAVITY FOR CONTACT WITH MOLTEN METAL TO BE INJECTED INTO SAID DIE CAVITY AND SAID COATING HAVIN AN EXPOSED SURFACE OF SUCH ROUGH, IRREGULAR AND POROUS NATURE AS TO BE REMOVED FROM SAID CORE ELEMENT AND ADHERED TO THE DIE CASTING FROM COMPLETION OF CASTING AND WITHDRAWAL OF SAID CORE ELEMENTS.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |