Patent US2520790A successfully refreshed from Google Patents.
Patent US3281137A successfully refreshed from Google Patents.
US3281137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory and furnace lining
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1964-02-12
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Granted: 1966-10-25
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Expires: 1984-02-12
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:31
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/44; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/12; C04B35/42; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A FUSED REFRACTORY MATERIAL CONSISTING OF, ANALYTICALLY BY WEIGHT, 85% TO 95% MGO, 5.0% TO 13% TIO2, UP TO 10% RO WHERE R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF FE, CA, BA, SR AND MIXTURES THEREOF, AND LESS THAN 5% OF OTHER OXIDES SELECTED FROM THE GROUP CONSISTING OF CR203, A1203, B203, SI02, ZR02, P205 AND MIXTURES THEREOF.
Claim 2
Dependent Claim
64 words
A FUSED REFRACTORY MATERIAL CONSISTING OF, ANALYTICALLY BY WEIGHT, AT LEAST 80% MG0, 1% TO 13% TI02, 1% TO 15% CR203, UP TO 10% RO WHERE R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF FE, CA, BA, SR AND MIXTURES THEREOF, AND LESS THAN 5% OF OTHER OXIDES SELECTED FROM THE GROUP CONSISTING OF A1203, B203, SI02, ZR02, P205 AND MIXTURES THEREOF.
References Cited (Backward Citations)
US3198643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |