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US3843341A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making thermally stable and crush resistant microporous glass catalyst supports

Assignee: PPG Industries Inc
•
Filing: 1972-12-01
•
Granted: 1974-10-22
•
Expires: 1992-12-01
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Abstract

Abstract 1. A METHOD FOR MAKING A LOW ALKALI-CONTAINING POROUS GLASS ARTICLE HAVING A HIGH THERMAL STABILITY COMPRISING: (A) HEATING A PHASE-SEPARABLE ALKALI-BOROSILICATE GLASSS TO A TEMPERATURE SUFFFICIENT TO SEPARATE THE GLASS INTO TWO PHASES, ONE OF WHICH IS A BORATE-RICH PHASE AND IS SOLUBLE IN AN AQUEOUS SOLUTION, (B) A FIRST LEACHING OF THE PHASE-SEPARATED GLASS WITH WATER FOR A TIME AND AT A TEMPERATURE SUFFICIENT TO REMOVE A MAJOR PORTION OF THE BORATE-RICH PHASE TO FORM A POROUS GLASS HIGH IN SILICA, (C) A SUBSEQUENT LEACHING OF THE PREVIOUSLY LEACHED POROUS GLASS WITH AN ACID FOR A TIME AND AT A TEM- PERATURE SUFFICIENT TO REMOVE SUFFICIENT ALKALI AND BORATE NOT REMOVAL IN THE FIRST LEACHING TO PROVIDE A LOW ALKALI-BORATE CONTAINING MICROPOROUS GLASS STRUCTURE HAVING A HIGH THERMAL STABILITY.

Inventors

  • 👤 J Hammel
  • 👤 T Allersma

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 12:23
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/02; B01D71/04; B01D39/00; B01D39/02; B01D39/06; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D67/00; B01D67/0039; B01D67/0053; B01D67/0058; B01J; B01J21/00; B01J21/06; B01J21/08; B01J37/00; B01J37/06; C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C03; C03C; C03C11/00; C03C11/005; C03C15/00; C03C23/00; C03C23/008; C03C3/00; C03C3/04; C03C3/06; C03C3/062; C03C3/064; C03C3/076; C03C3/089; C03C3/091; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2201/30; C03C2201/32; C03C2201/50; C03C2201/80; C03C2203/00; C03C2203/10; C03C2203/50; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 102 words
A METHOD FOR MAKING A LOW ALKALI-CONTAINING POROUS GLASS ARTICLE HAVING A HIGH THERMAL STABILITY COMPRISING: (A) HEATING A PHASE-SEPARABLE ALKALI-BOROSILICATE GLASSS TO A TEMPERATURE SUFFFICIENT TO SEPARATE THE GLASS INTO TWO PHASES, ONE OF WHICH IS A BORATE-RICH PHASE AND IS SOLUBLE IN AN AQUEOUS SOLUTION, (B) A FIRST LEACHING OF THE PHASE-SEPARATED GLASS WITH WATER FOR A TIME AND AT A TEMPERATURE SUFFICIENT TO REMOVE A MAJOR PORTION OF THE BORATE-RICH PHASE TO FORM A POROUS GLASS HIGH IN SILICA, (C) A SUBSEQUENT LEACHING OF THE PREVIOUSLY LEACHED POROUS GLASS WITH AN ACID FOR A TIME AND AT A TEM-
Claim 2
Independent Claim 102 words
A METHOD FOR MAKING A LOW ALKALI-CONTAINING POROUS GLASS ARTICLE HAVING A HIGH THERMAL STABILITY COMPRISING: (A) HEATING A PHASE-SEPARABLE ALKALI-BOROSILICATE GLASSS TO A TEMPERATURE SUFFFICIENT TO SEPARATE THE GLASS INTO TWO PHASES, ONE OF WHICH IS A BORATE-RICH PHASE AND IS SOLUBLE IN AN AQUEOUS SOLUTION, (B) A FIRST LEACHING OF THE PHASE-SEPARATED GLASS WITH WATER FOR A TIME AND AT A TEMPERATURE SUFFICIENT TO REMOVE A MAJOR PORTION OF THE BORATE-RICH PHASE TO FORM A POROUS GLASS HIGH IN SILICA, (C) A SUBSEQUENT LEACHING OF THE PREVIOUSLY LEACHED POROUS GLASS WITH AN ACID FOR A TIME AND AT A TEM-

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-21 1978-04-22 1978-10-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-21 1982-04-22 1982-10-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-21 1986-04-22 1986-10-22 $7700.00 Window Closed / Lapsed

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