Patent US5286290A successfully refreshed from Google Patents.
US5286290A
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Filler and artificial stone made therewith
Assignee: AVONITE Inc A CORP OF
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Filing: 1992-04-16
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Granted: 1994-02-15
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Expires: 2012-04-16
Abstract
Abstract Alumina trihydrate is dehydrated and rehydrated with a solution of dye, then dried to make colored alumina trihydrate which is distributed in a resin matrix to make solid decorative materials, such as artificial granite having excellent fire retardance.
Inventors
- 👤 Lon F. Risley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/407; C08; C08K; C08K9/00; C08K9/12; C09C3/00; C09C3/08; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
38 words
Method of making alumina trihydrate having a colorant incorporated therein comprising hydrating an alumina having less than three moles of water of hydration in the presence of a water-soluble colorant and in the absence of a laking aid.
Claim 2
Dependent Claim
38 words
Method of making alumina trihydrate having a colorant incorporated therein comprising hydrating an alumina having less than three moles of water of hydration in the presence of a water-soluble colorant and in the absence of a laking aid.
Claim 3
Dependent Claim
37 words
Method of making alumina trihydrate particles colored throughout comprising hydrating particles of alumina having less than three moles of water of hydration in the presence of a water-soluble dye and in the absence of a laking aid.
Claim 4
Dependent Claim
37 words
Method of making alumina trihydrate particles colored throughout comprising hydrating particles of alumina having less than three moles of water of hydration in the presence of a water-soluble dye and in the absence of a laking aid.
Claim 5
Dependent Claim
14 words
Alumina trihydrate having a colorant incorporated therein made by the method of claim 1.
Claim 6
Dependent Claim
24 words
Alumina trihydrate of claim 3 wherein the colorant is present as a residue after rehydration of the alumina trihydrate with an aqueous colorant solution.
Claim 7
Dependent Claim
12 words
Alumina trihydrate particles colored throughout made by the method of claim 2.
Claim 8
Dependent Claim
14 words
Particles of claim 5 having dimensions of about one micron to about 0.127 cm.
Claim 9
Dependent Claim
22 words
Method of claim 1 wherein the alumina having less than three moles of water of hydration is made by heating alumina trihydrate.
Claim 10
Dependent Claim
26 words
Method of claim 1 wherein the alumina having less than three moles of water of hydration weighs about 19% to about 23% less than alumina trihydrate.
Claim 11
Dependent Claim
19 words
Method of claim 1 wherein the hydration step is conducted in the presence of an aqueous solution of dye.
Claim 12
Dependent Claim
15 words
Method of claim 9 wherein the aqueous solution comprises about 0.5% to about 3.0% dye.
Claim 13
Dependent Claim
19 words
Method of claim 9 wherein the hydration step is conducted at a temperature from ambient to about 99° C.
Claim 14
Dependent Claim
63 words
Method of making colored alumina trihydrate comprising (a) dehydrating alumina trihydrate, and (b) rehydrating the resulting dehydrated alumina by immersing it in an aqueous solution of a water-soluble dye at about 20° C. to about 99° C. for a time sufficient to absorb at least about 75% of the water removed in step (a), whereby the dye is incorporated into the alumina trihydrate.
Claim 15
Dependent Claim
63 words
Method of making colored alumina trihydrate comprising (a) dehydrating alumina trihydrate, and (b) rehydrating the resulting dehydrated alumina by immersing it in an aqueous solution of a water-soluble dye at about 20° C. to about 99° C. for a time sufficient to absorb at least about 75% of the water removed in step (a), whereby the dye is incorporated into the alumina trihydrate.
Claim 16
Dependent Claim
9 words
Method of claim 12 followed by drying the alumina.
Claim 17
Dependent Claim
26 words
Method of claim 12 wherein the residual hydration in the alumina (the percentage of the original water) after step (a) is about 15% to about 25%.
Claim 18
Dependent Claim
23 words
Method of claim 12 wherein the rehydration step (b) achieves complete hydration of the alumina while incorporating about 0.5% to about 25% dye.
Claim 19
Dependent Claim
35 words
Method of claim 12 wherein the dye solution of step (b) includes about 2% to about 10% of a polyol selected from the group consisting of propylene glycol, dipropylene glycol, ethylene glycol, and diethylene glycol.
Claim 20
Dependent Claim
31 words
Method of claim 12 wherein the dehydration of step (a) is conducted at a temperature from about 180° C. to about 290° C. for about 45 minutes to about 90 minutes.
Claim 21
Dependent Claim
21 words
Method of claim 12 wherein the water-soluble dye solution of step (b) has a concentration of about 0.5% to about 3%.
Claim 22
Dependent Claim
21 words
Method of claim 12 wherein the alumina trihydrate in step (a) comprises particles of about 1 micron to about 1.27 cm.
Claim 23
Dependent Claim
11 words
A colored aluminum trihydrate made by the process of claim 12.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |