US2571101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesia refractory
Assignee: —
•
Filing: —
•
Granted: 1951-10-16
•
Expires: 1968-10-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/3222; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/70; C04B2235/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
DENSE, NON-FUSED MAGNESIA REFRACTORY MATERIAL CONTAINING AT LEAST 95% OF MAGNESIUM OXIDE AND NOT OVER 2.0% SILICA AND CONSISTING OF MAGNESIUM OXDE CRYSTALS, A MAJOR PROPORTION OF THE SURFACE OF SAID CRYSTALS ABUTTING DIRECTLY
Claim 2
Dependent Claim
34 words
DENSE, NON-FUSED MAGNESIA REFRACTORY MATERIAL CONTAINING AT LEAST 95% OF MAGNESIUM OXIDE AND NOT OVER 2.0% SILICA AND CONSISTING OF MAGNESIUM OXDE CRYSTALS, A MAJOR PROPORTION OF THE SURFACE OF SAID CRYSTALS ABUTTING DIRECTLY
References Cited (Backward Citations)
GB142721A
Cited
GB190913697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |