Patent US3070449A successfully refreshed from Google Patents.
US3070449A
Expired / Lapsed
US
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Refractory practices
Assignee: Harbison Walker Refractories Co
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Filing: 1961-04-07
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Granted: 1962-12-25
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Expires: 1981-04-07
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 Ernest P Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/013; C10; C10C; C10C1/00; C10C1/005; Y; Y10; Y10S; Y10S264/00; Y10S264/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF FORMING SLAG-RESISTANT PITCH BONDED BASIC REFRACTORY BRICK COMPRISING A PITCH, HAVING A SOFTENING RANGE OF ABOUT 15/* TO 250*F., TO A TEMPERATURE ABOUE ITS SOFTENING POINT, PROVIDING A REFRACTORY AGGREGATE BATCH OF GRAIN OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF DEAD BURNED LIME, DEAD BURNED DOLOMITE AND DEAD BURNED MAGNESIA MIXING SAID REFRACTORY AGGREGATE AND ABOUT 3 TO 8 WEIGHT PERCENT, BASED ON THE WEIGHT OF SAID AGGREGATE, OF SAID LIQUEFIED PITCH THEN INCORPORATING IN THE RESULTING MIXTURE ABOUT 2 TO 12 WEIGHT PERCENT, BASED ON THE WEIGHT OF SAID REFRACTORY AGGREGATE, OF A SOLID, POWDERED PITCH HAVING A SOFTENING POINT IN THE TEMPERATURE RANGE OF ABOUT 275* TO 450*F., AND PRESSING BRICK FROM THE RESULTING BATCH.
Claim 2
Independent Claim
124 words
A METHOD OF FORMING SLAG-RESISTANT PITCH BONDED BASIC REFRACTORY BRICK COMPRISING A PITCH, HAVING A SOFTENING RANGE OF ABOUT 15/* TO 250*F., TO A TEMPERATURE ABOUE ITS SOFTENING POINT, PROVIDING A REFRACTORY AGGREGATE BATCH OF GRAIN OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF DEAD BURNED LIME, DEAD BURNED DOLOMITE AND DEAD BURNED MAGNESIA MIXING SAID REFRACTORY AGGREGATE AND ABOUT 3 TO 8 WEIGHT PERCENT, BASED ON THE WEIGHT OF SAID AGGREGATE, OF SAID LIQUEFIED PITCH THEN INCORPORATING IN THE RESULTING MIXTURE ABOUT 2 TO 12 WEIGHT PERCENT, BASED ON THE WEIGHT OF SAID REFRACTORY AGGREGATE, OF A SOLID, POWDERED PITCH HAVING A SOFTENING POINT IN THE TEMPERATURE RANGE OF ABOUT 275* TO 450*F., AND PRESSING BRICK FROM THE RESULTING BATCH.
References Cited (Backward Citations)
US3015850A
Cited
US2640759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |