Patent US2866727A successfully refreshed from Google Patents.
US2866727A
Expired / Lapsed
US
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Production of metal articles with holes in them
Assignee: Huntington Alloys Corp
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Filing: 1957-09-03
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Granted: 1958-12-30
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Expires: 1977-09-03
Abstract
No abstract record available.
Inventors
- 👤 Keegan Barclay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:11
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; B; B21; B21C; B21C23/00; B21C23/01; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
A PROCESS FOR PRODUCING HALLOW METAL ARTICLES FROM HEAT-RESISTANT METAL WHICH COMPRISES IN COMBINATION THE STEPS OF HOT WORKING A BILLET OF HEAT-RESISTANT METAL FILLED WITH A FERROUS FILLER, PRETREATING THE FORMED HEAT-RESISTANT METAL CONTAINING SAID FERROUS FILLER BY SUBJECTING IT TO A CHEMICAL ETCHING TREATMENT IN AN AQUEOUS SOLUTION OF ACID SELECTED FROM THE GROUP CONSISTING OF SULPHURIC ACID, HYDROCHLORIC ACID AND NITRIC ACID, WHICH CONTAINS BETWEEN ABOUT 50% TO ABOUT 60% FREE CONCENTRATED ACID, TO REMOVE THE SURFACE LAYER FROM SAID FORMED HEAT-RESISTANT METAL AND THEREAFTER REMOVING SAID FERROUS FILLER FROM SAID FORMED HEAT-RESISTANT METAL BY SELECTIVELY LEACHING SAID FERROUS FILLER IN AN ACIDIC MEDIUM.
References Cited (Backward Citations)
US2047555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |