Patent US882019A successfully refreshed from Google Patents.
US2895840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kiln refractory
Assignee: —
•
Filing: —
•
Granted: 1959-07-21
•
Expires: 1976-07-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/34; C04B2235/3427; C04B2235/3463; C04B2235/349; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/5463; C04B2235/5472; C04B2235/70; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A REFRACTORY ARTICLE MADE BY CASTING AND SUBSEQUENTLY DRYING AND THEN FIRING AT SINTERING TEMPERATURE A RAW BATCH CONSISTING ESSENTIALLY OF ABOUT FROM 66% TO 78% CORUNDUM, FROM 4% TO 12% CLAY AND FROM 10% TO 28% MULLITE, SAID CORUNDUM BEING CHARACTERIZED BY SHARPLY ANGULAR GRAINS WHICH ARE A COMPOSITE OF INTERGROWN CRYSTALS AND FRAGMENTS OF CRYSTALS OF VARIOUS SIZES, AT LEAST ABOUT 25% OF SAID CORUNDUM HAVING A RELATIVELY LARGE GRAIN SIZE OF ABOUT 1/8 TO 1/4 INCH, AT LEAST ABOUT 15% OF SAID CORUNDUM HAVING AN INTERMEDIATE GRAIN SIZE OF FROM ABOUT 14 TO 325 MESH AND AT LEAST ABOUT 20% OF SAID CORUNDUM HAVING A RELATIVELY SMALL GRAIN SIZE OF LESS THAN ABOUT 325 MESH.
Claim 2
Dependent Claim
118 words
A REFRACTORY ARTICLE MADE BY CASTING AND SUBSEQUENTLY DRYING AND THEN FIRING AT SINTERING TEMPERATURE A RAW BATCH CONSISTING ESSENTIALLY OF ABOUT FROM 66% TO 78% CORUNDUM, FROM 4% TO 12% CLAY AND FROM 10% TO 28% MULLITE, SAID CORUNDUM BEING CHARACTERIZED BY SHARPLY ANGULAR GRAINS WHICH ARE A COMPOSITE OF INTERGROWN CRYSTALS AND FRAGMENTS OF CRYSTALS OF VARIOUS SIZES, AT LEAST ABOUT 25% OF SAID CORUNDUM HAVING A RELATIVELY LARGE GRAIN SIZE OF ABOUT 1/8 TO 1/4 INCH, AT LEAST ABOUT 15% OF SAID CORUNDUM HAVING AN INTERMEDIATE GRAIN SIZE OF FROM ABOUT 14 TO 325 MESH AND AT LEAST ABOUT 20% OF SAID CORUNDUM HAVING A RELATIVELY SMALL GRAIN SIZE OF LESS THAN ABOUT 325 MESH.
References Cited (Backward Citations)
US1897183A
Cited
US2118798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |