US2935772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of scale formation on castings
Assignee: Shaw Process Dev Corp
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Filing: 1957-04-03
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Granted: 1960-05-10
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Expires: 1977-04-03
Abstract
No abstract record available.
Inventors
- 👤 Shaw Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:43
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/003; B22C; B22C23/00; B22C23/02; C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A METHOD OF PREVENTING SCALE FORMATION ON A METAL CASTING DURING THE COOLING THEREOF IN A MOULD WHICH COMPRISES PLACING SOLID HEXAMETHYLENE TETRAMINE IN PROXIMITY TO THE METAL WHEREBY THE HEAT THEREOF CAUSES VOLATILIZATION OF THE HEXAMETHYLENE TETRAMINE AND ENCLOSING THE MOULD SO AS THEREBY TO MAINTAIN THE GASIFIED HEXAMETHYLENE TETRAMINE AROUND THE MOULD.
Claim 2
Independent Claim
54 words
A METHOD OF PREVENTING SCALE FORMATION ON A METAL CASTING DURING THE COOLING THEREOF IN A MOULD WHICH COMPRISES PLACING SOLID HEXAMETHYLENE TETRAMINE IN PROXIMITY TO THE METAL WHEREBY THE HEAT THEREOF CAUSES VOLATILIZATION OF THE HEXAMETHYLENE TETRAMINE AND ENCLOSING THE MOULD SO AS THEREBY TO MAINTAIN THE GASIFIED HEXAMETHYLENE TETRAMINE AROUND THE MOULD.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |