Patent US3133134A successfully refreshed from Google Patents.
US3133134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of articles
Assignee: —
•
Filing: —
•
Granted: 1964-05-12
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Expires: 1981-05-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:47
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/26; C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/3222; C04B2235/44; C04B2235/449; C04B2235/70; C04B2235/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR MAKING MAGNESIUM OXIDE REFRACTORY ARTICLES WHEREIN THE MAGNESIUM OXIDE SLIP IS FORMED FROM GROUND MAGNESIUM OXIDE, CAST IN A POROUS MOLD, EXTRACTED FROM THE MOLD, AND SUBSEQUENTLY FIRED, THE IMPROVEMENT WHEREIN (A) SAID MAGNESIUM OXIDE IS DRY-MILLED INTHE PRESENCE OF 0.1 TO 1.0% BY WEIGHT OF ACETIC ANHYDRIDE PRIOR TO THE SLIP FORMATION, WHEREBY THE MAGNESIUM OXIDE IS PROTECTED FROM THE ACTION OF CARBON DIOXIDE, AND (B) SAID SLIP CONTAINS AN AQUEOUS SOLUTION OF TARTRATE ANION, SAID SOLUTION CONTAINING SAI DANION IN AN AMOUNT EQUIVALENT TO 0.1 TO 10% BY WEIGHT OF THE MAGNESIUM COMPOUND OF THE ANION.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR MAKING MAGNESIUM OXIDE REFRACTORY ARTICLES WHEREIN THE MAGNESIUM OXIDE SLIP IS FORMED FROM GROUND MAGNESIUM OXIDE, CAST IN A POROUS MOLD, EXTRACTED FROM THE MOLD, AND SUBSEQUENTLY FIRED, THE IMPROVEMENT WHEREIN (A) SAID MAGNESIUM OXIDE IS DRY-MILLED INTHE PRESENCE OF 0.1 TO 1.0% BY WEIGHT OF ACETIC ANHYDRIDE PRIOR TO THE SLIP FORMATION, WHEREBY THE MAGNESIUM OXIDE IS PROTECTED FROM THE ACTION OF CARBON DIOXIDE, AND (B) SAID SLIP CONTAINS AN AQUEOUS SOLUTION OF TARTRATE ANION, SAID SOLUTION CONTAINING SAI DANION IN AN AMOUNT EQUIVALENT TO 0.1 TO 10% BY WEIGHT OF THE MAGNESIUM COMPOUND OF THE ANION.
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) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |