Patent US4767738A successfully refreshed from Google Patents.
US4767738A
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Lead aluminum borate
Assignee: BP Corp North America Inc
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Filing: 1986-11-20
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Granted: 1988-08-30
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Expires: 2006-11-20
Abstract
Abstract The present invention is a novel crystalline lead aluminum borate composition characterized by a unique x-ray diffraction pattern.
Inventors
- 👤 John L. Melquist
- 👤 Melvin L. Luetkens, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:02
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/08; C01B35/10; C01B35/12; C01B35/128; B; B01; B01J; B01J23/00; B01J23/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A crystalline lead aluminum borate composition consisting essentially of lead, aluminum, and boron oxides and having the general formula (x) PbO. (y) 24 .Al 2 O 3 . (z) B 2 O 3 where x, y, and z are numbers representing molar amounts such that the mole fraction of PbO calculated as x/(x+y+z), is within the range of about 0.5 to about 0.8; the mole fraction of AL 2 O 3 calculated as y/(x+y+z) is within the range of about 0.05 to about 0.3; and the mole fraction of B 2 O 3 calculated as z/(x+y+z) is within the range of about 0.05 to about 0.25 and said composition having the significant x-ray diffraction lines of Table A.
Claim 2
Dependent Claim
118 words
A crystalline lead aluminum borate composition consisting essentially of lead, aluminum, and boron oxides and having the general formula (x) PbO. (y) 24 .Al 2 O 3 . (z) B 2 O 3 where x, y, and z are numbers representing molar amounts such that the mole fraction of PbO calculated as x/(x+y+z), is within the range of about 0.5 to about 0.8; the mole fraction of AL 2 O 3 calculated as y/(x+y+z) is within the range of about 0.05 to about 0.3; and the mole fraction of B 2 O 3 calculated as z/(x+y+z) is within the range of about 0.05 to about 0.25 and said composition having the significant x-ray diffraction lines of Table A.
Claim 3
Dependent Claim
20 words
The crystalline lead aluminum borate of claim 1 represented by the shaded area of the phase diagram of FIG. 2.
Claim 4
Dependent Claim
25 words
The crystalline lead aluminum borate of claim 1 having the approximate formula 4 PbO. 1 Al 2 O 3 .1 B 2 O 3 .
Claim 5
Dependent Claim
70 words
Crystalline lead aluminum borate of the approximate formula 4 PbO./Al 2 O 3 .1 B 2 O 3 having the significant x-ray diffraction lines of Table A prepared by combining, in a liquid medium, suitable precursors consisting essentially of lead, aluminum, and boron oxides, removing the liquid to obtain a superficially dry precursor combination, and calcining the combination at about 650 to 800° C. to obtain crystalline lead aluminum borate.
Claim 6
Dependent Claim
70 words
Crystalline lead aluminum borate of the approximate formula 4 PbO./Al 2 O 3 .1 B 2 O 3 having the significant x-ray diffraction lines of Table A prepared by combining, in a liquid medium, suitable precursors consisting essentially of lead, aluminum, and boron oxides, removing the liquid to obtain a superficially dry precursor combination, and calcining the combination at about 650 to 800° C. to obtain crystalline lead aluminum borate.
Claim 7
Dependent Claim
54 words
A process for preparing crystalline lead aluminum borate having the significant x-ray lines of Table A which process comprises (a) combining suitable precursors of lead, aluminum, and boron oxides in a liquid medium; (b) removing the liquid to obtain a superficially dry precursor mixture; and (c) calcining the mixture at 650 to 800° C.
Claim 8
Dependent Claim
54 words
A process for preparing crystalline lead aluminum borate having the significant x-ray lines of Table A which process comprises (a) combining suitable precursors of lead, aluminum, and boron oxides in a liquid medium; (b) removing the liquid to obtain a superficially dry precursor mixture; and (c) calcining the mixture at 650 to 800° C.
Claim 9
Dependent Claim
16 words
The process of claim 5 wherein the liquid medium includes aqueous ammonia or aqueous ammonium salt.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |