US2501336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory shape and method of making
Assignee: Harbison Walker Refractories Co
•
Filing: 1948-05-08
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Granted: 1950-03-21
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Expires: 1968-05-08
Abstract
No abstract record available.
Inventors
- 👤 Hyde Collin
- 👤 Francis P Shonkwiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:21
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THAT METHOD OF MAKING REFRACTORY SHAPES WHICH COMPRISES PROVIDING A BATCH OF AT LEAST ONE NON-PLASTIC REFRACTORY MATERIAL OF THE GROUP CONSISTING OF MAGNESIAN REFRACTORY, CHROME ORE AND CALCINED ALUMINA, ADDING FROM ABOUT 1 TO ABOUT 5 PER CENT OF TALL OIL TO THE BATCH, THEN FORMING SHAPES FROM THE BATCH, AND DRYING AND FIRING THE SHAPES.
Claim 2
Dependent Claim
57 words
THAT METHOD OF MAKING REFRACTORY SHAPES WHICH COMPRISES PROVIDING A BATCH OF AT LEAST ONE NON-PLASTIC REFRACTORY MATERIAL OF THE GROUP CONSISTING OF MAGNESIAN REFRACTORY, CHROME ORE AND CALCINED ALUMINA, ADDING FROM ABOUT 1 TO ABOUT 5 PER CENT OF TALL OIL TO THE BATCH, THEN FORMING SHAPES FROM THE BATCH, AND DRYING AND FIRING THE SHAPES.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |