US3261699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Table ii
Assignee: —
•
Filing: —
•
Granted: 1966-07-19
•
Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; C04B35/10; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B35/63; C04B35/6303; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/3222; C04B2235/44; C04B2235/444; C04B2235/445; C04B2235/70; C04B2235/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF MAKING A REFRACTORY BODY OF IMPROVED QUALITY COMPRISING PREPARING A REFRACTORY MIXTURE CONSISTING ESSENTIALLY OF A MAJOR PORTION OF ALUMINA AND A MINOR PORTION OF AT LEAST ONE FLUORIDE FROM THE GROUP CONSISTING OF ALKALI METAL FLUORIDES, ALKALINE EARTH METAL FLUORIDES, AND ALUMINUM FLORIDE, MILLING THE MIXTURE PRECALCINING THE REFRACTORY MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 500*C., PRESSINGG THE REFACTORY MIXTURE INTO DESIRED FORM, AND FIRING THE PRESSED FORM AT A TEMPERATURE OF AT LEAST ABOUT 850*C. AND BELOW THE VOLATILIZATION TEMPERATURE OF SAID FLUORIDE CONSTITUENT.
Claim 2
Independent Claim
91 words
A METHOD OF MAKING A REFRACTORY BODY OF IMPROVED QUALITY COMPRISING PREPARING A REFRACTORY MIXTURE CONSISTING ESSENTIALLY OF A MAJOR PORTION OF ALUMINA AND A MINOR PORTION OF AT LEAST ONE FLUORIDE FROM THE GROUP CONSISTING OF ALKALI METAL FLUORIDES, ALKALINE EARTH METAL FLUORIDES, AND ALUMINUM FLORIDE, MILLING THE MIXTURE PRECALCINING THE REFRACTORY MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 500*C., PRESSINGG THE REFACTORY MIXTURE INTO DESIRED FORM, AND FIRING THE PRESSED FORM AT A TEMPERATURE OF AT LEAST ABOUT 850*C. AND BELOW THE VOLATILIZATION TEMPERATURE OF SAID FLUORIDE CONSTITUENT.
References Cited (Backward Citations)
US3093570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |