US2821758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot tops
Assignee: Individual
•
Filing: 1956-11-21
•
Granted: 1958-02-04
•
Expires: 1976-11-21
Abstract
No abstract record available.
Inventors
- 👤 Vallak Enn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A HOT TOP, FOR USE IN CONNECTION WITH A CHILL MOLD FOR CASTING MATERIALS AND ADAPTED TO BE DISPOSED NEAR THE UPPER PORTION OF SAID CHILL MOLD DURING THE CASTING, SAID HOT TOP BEING COMPOSED OF COMBUSTIBLE MATERIAL INCLUDING FROM 50 TO 100 PERCENT PULVERIZED COKE AND FROM 50 TO 0 PERCENT SAW DUST, RESPECTIVELY, AND A BINDING AGENT AND HAVING A THROUGH POROSITY OF FROM 25 TO 60 PERCENT BY VOLUME.
Claim 2
Dependent Claim
72 words
A HOT TOP, FOR USE IN CONNECTION WITH A CHILL MOLD FOR CASTING MATERIALS AND ADAPTED TO BE DISPOSED NEAR THE UPPER PORTION OF SAID CHILL MOLD DURING THE CASTING, SAID HOT TOP BEING COMPOSED OF COMBUSTIBLE MATERIAL INCLUDING FROM 50 TO 100 PERCENT PULVERIZED COKE AND FROM 50 TO 0 PERCENT SAW DUST, RESPECTIVELY, AND A BINDING AGENT AND HAVING A THROUGH POROSITY OF FROM 25 TO 60 PERCENT BY VOLUME.
Claim 3
Dependent Claim
36 words
A HOT TOP AS CLAIMED IN CLAIM 11, SAID BINDING AGENT COMPRISING MATERIAL TAKEN FROM A GROUP CONSISTING OF SULPHITE LYE, SULPHITE LYE AND WATER IN EQUAL PROPORTIONS BY VOLUME, WATER GLASS 38* BEAUME, AND MOLASSES.
Claim 4
Dependent Claim
22 words
A HOT TOP AS CLAIM 11, AND A PROTECTIVE COATING COMPRISING A MIXTURE OF ALUMINUM AND IRON OXIDE POWER IN SLUPHITE LYE.
References Cited (Backward Citations)
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Cited
US1696395A
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US1741615A
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US1778316A
Cited
US1819364A
Cited
US1804205A
Cited
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Cited
US2462256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |