US3174881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making porous contact masses
Assignee: Air Products and Chemicals Inc
•
Filing: 1960-05-31
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Granted: 1965-03-23
•
Expires: 1980-05-31
Abstract
No abstract record available.
Inventors
- 👤 James E Mcevoy
- 👤 Shalit Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:28
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M4/8605; H01M4/8621; H01M8/00; H01M8/02; H01M8/0289; H01M2004/8678; H01M2004/8684; H01M8/0295; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
THE METHOD OF MAKING A POROUS, ALKALI-RESISTANT CONTACT MASS HAVING A RELATIVELY HIGH DEGREE OF HARDNESS AND STRENGTH, WHICH COMPRISES THE STEPS OF: FIRING A PORTION OF REAGENT-GRADE, RAW MAGNESIUM OXIDE POWDER BY HEATING THE SAME AT A TEMPERATURE IN THE RANGE OF ABOUT 22002500*F. FOR ABOUT 10-60 MINUTES; GRINDING THE FIRED OXIDE TO POWDER SIZE IN THE RANGE OF ABOUT 20-100 MESH, U.S. STANDARD; ADMIXING THE FIRED, GROUND AND GRADED OXIDE POWDER WITH ANOTHER, AND RELATIVELY SUBSTANTIAL, PORTION OF SAID RAW MAGNESIUM OXIDE POWDER; ADDING AQUEOUS NITRIC ACID OF 10-70 WT. PERCENT CONCENTRATION TO THE DRY MIX IN AN AMOUNT SUFFICIENT ONLY TO FORM A READILY EXTRUDABLE AND MOLDABLE PASTE, SAID NITIC ACID REACTING WITH A PORTION OF THE RAW MAGNESIUM OXIDE COMPONENT OF SAID PASTE TO PROVIDE AN INTERPARTICLE FILM OF MAGNESIUM NITRATE AS A PASTY BINDER; SHAPING SAID PASTE TO THE DESIRED CONTACT MASS FORM; DRYING THE SHAPED CONTACT MASS AT A TEMPERATURE OF ABOUT 250*F.; AND FIRING THE DRIED CONTACT MASS AT A TEMPERATURE IN THE RANGE OF ABOUT 18002500*F. FOR A PERIOD OF ABOUT 10-60 MINUTES, THEREBY THERMALLY DECOMPOSING SAID MAGNESIUM NITRATE BINDER AND SINTERING THE REMAINING UNREACTED PORTION OF RAW MAGNESIUM OXIDE TO IMPART THE DESIRED CHARACTERISTICS OF STRENGTH, HARDNESS AND POROSITY TO SAID CONTACT MASS.
Claim 2
Independent Claim
212 words
THE METHOD OF MAKING A POROUS, ALKALI-RESISTANT CONTACT MASS HAVING A RELATIVELY HIGH DEGREE OF HARDNESS AND STRENGTH, WHICH COMPRISES THE STEPS OF: FIRING A PORTION OF REAGENT-GRADE, RAW MAGNESIUM OXIDE POWDER BY HEATING THE SAME AT A TEMPERATURE IN THE RANGE OF ABOUT 22002500*F. FOR ABOUT 10-60 MINUTES; GRINDING THE FIRED OXIDE TO POWDER SIZE IN THE RANGE OF ABOUT 20-100 MESH, U.S. STANDARD; ADMIXING THE FIRED, GROUND AND GRADED OXIDE POWDER WITH ANOTHER, AND RELATIVELY SUBSTANTIAL, PORTION OF SAID RAW MAGNESIUM OXIDE POWDER; ADDING AQUEOUS NITRIC ACID OF 10-70 WT. PERCENT CONCENTRATION TO THE DRY MIX IN AN AMOUNT SUFFICIENT ONLY TO FORM A READILY EXTRUDABLE AND MOLDABLE PASTE, SAID NITIC ACID REACTING WITH A PORTION OF THE RAW MAGNESIUM OXIDE COMPONENT OF SAID PASTE TO PROVIDE AN INTERPARTICLE FILM OF MAGNESIUM NITRATE AS A PASTY BINDER; SHAPING SAID PASTE TO THE DESIRED CONTACT MASS FORM; DRYING THE SHAPED CONTACT MASS AT A TEMPERATURE OF ABOUT 250*F.; AND FIRING THE DRIED CONTACT MASS AT A TEMPERATURE IN THE RANGE OF ABOUT 18002500*F. FOR A PERIOD OF ABOUT 10-60 MINUTES, THEREBY THERMALLY DECOMPOSING SAID MAGNESIUM NITRATE BINDER AND SINTERING THE REMAINING UNREACTED PORTION OF RAW MAGNESIUM OXIDE TO IMPART THE DESIRED CHARACTERISTICS OF STRENGTH, HARDNESS AND POROSITY TO SAID CONTACT MASS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |