US2749609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming hollow metal articles
Assignee: Carnegie Illinois Steel Corp
•
Filing: 1950-02-14
•
Granted: 1956-06-12
•
Expires: 1970-02-14
Abstract
No abstract record available.
Inventors
- 👤 Charles B Francis
- 👤 Ralph B Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:04
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/006; B29; B29C; B29C41/00; B29C41/02; B29C41/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF FORMING HOLLOW METAL ARTICLES WHICH COMPRISES INSERTING A RELATIVELY COLD METAL BAR, THE OUTSIDE OF WHICH CONFORMS IN SHAPE AND DIMENSIONS TO THE INSIDE OF THE ARTICLE, IN A BATH OF LIQUID METAL, MAINTAINING THE MAIN BODY OF THE BATH TEMPERATURE NOT BELOW ITS LIQUIDUS POINT WHILE THE BAR IS IN THE BATH, REMOVING THE BAR FROM THE TOP OF SAID BATH AFTER A PREDETERMINED PERIOD OF TIME WHEREBY THE DESIRED THICKNESS OF METAL SOLIDIFIES ON SAID BAR, THE IMMEDIATELY PASSING THE BAR WITH THE SOLIDIFIED METAL THEREON THROUGH A STATIONARY DIE WHICH CONFORMS IN SHAPE AND DIMENSIONS TO THE OUTSIDE OF THE ARTICLE, COOLING THE METAL COLLECTED ON THE BAR, AND THEREAFTER REMOVING THE BAR FROM THE INSIDE OF SAID ARTICLE.
Claim 2
Independent Claim
125 words
THE METHOD OF FORMING HOLLOW METAL ARTICLES WHICH COMPRISES INSERTING A RELATIVELY COLD METAL BAR, THE OUTSIDE OF WHICH CONFORMS IN SHAPE AND DIMENSIONS TO THE INSIDE OF THE ARTICLE, IN A BATH OF LIQUID METAL, MAINTAINING THE MAIN BODY OF THE BATH TEMPERATURE NOT BELOW ITS LIQUIDUS POINT WHILE THE BAR IS IN THE BATH, REMOVING THE BAR FROM THE TOP OF SAID BATH AFTER A PREDETERMINED PERIOD OF TIME WHEREBY THE DESIRED THICKNESS OF METAL SOLIDIFIES ON SAID BAR, THE IMMEDIATELY PASSING THE BAR WITH THE SOLIDIFIED METAL THEREON THROUGH A STATIONARY DIE WHICH CONFORMS IN SHAPE AND DIMENSIONS TO THE OUTSIDE OF THE ARTICLE, COOLING THE METAL COLLECTED ON THE BAR, AND THEREAFTER REMOVING THE BAR FROM THE INSIDE OF SAID ARTICLE.
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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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |