US2805167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic spinel refractory products
Assignee: Harbison Walker Refractories Co
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Filing: 1954-05-18
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Granted: 1957-09-03
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Expires: 1974-05-18
Abstract
No abstract record available.
Inventors
- 👤 Donald O Mccreight
- 👤 Raymond E Birch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THAT METHOD OF MAKING REFRACTORY SHAPES COMPRISING MIXING MAGNESIUM HYDROXIDE AND ALUMINUM HYDROXIDE IN PROPORTIONS CORRESPONDING SUBSTANTIALLY TO MG0.AL203 WITH SUFFICIENT WATER FOR GOOD MIXING, DRYING THE MIX TO A WATER CONTENT LESS THAN REQUIRED FOR FORMING SHAPES, THEN MIXING THE DRIED MATERIAL WITH WATER TO FORMING CONSISTENCY, THEN FORMING SHAPES THEREFROM, AND BURNING THE SHAPES TO FORM REFRACTORY SPINEL GRAIN OF LOW TRUE POROSITY.
Claim 2
Dependent Claim
65 words
THAT METHOD OF MAKING REFRACTORY SHAPES COMPRISING MIXING MAGNESIUM HYDROXIDE AND ALUMINUM HYDROXIDE IN PROPORTIONS CORRESPONDING SUBSTANTIALLY TO MG0.AL203 WITH SUFFICIENT WATER FOR GOOD MIXING, DRYING THE MIX TO A WATER CONTENT LESS THAN REQUIRED FOR FORMING SHAPES, THEN MIXING THE DRIED MATERIAL WITH WATER TO FORMING CONSISTENCY, THEN FORMING SHAPES THEREFROM, AND BURNING THE SHAPES TO FORM REFRACTORY SPINEL GRAIN OF LOW TRUE POROSITY.
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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |