US5284512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyaspartic acid and its salts for dispersing suspended solids
Assignee: Donlar Corp
•
Filing: 1993-02-16
•
Granted: 1994-02-08
•
Expires: 2013-02-16
Abstract
Abstract Water soluble salts of a β-polyaspartic acid, i.e., a polyaspartic acid having predominantly beta linkages in the amino acid residue chain thereof, are eminently well suited as dispersants for particulate matter in an aqueous medium.
Inventors
- 👤 Larry P. Koskan
- 👤 Kim C. Low
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:36
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1092; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086; C09D; C09D17/00; C09D17/004; C09K; C09K23/00; C09K23/16; C09K23/28; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06; Y10S516/07; Y10S516/901; Y10S516/905; Y10S516/914; Y10S516/915
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
An aqueous suspension of finely divided solid particles which are maintained in suspension by a suspension stabilizing amount of a water soluble salt of polyaspartic acid in which at least 50 percent of the amino acid residue linkages are beta-linkages and having a weight average molecular weight of about 1000 to about 5,000.
Claim 2
Dependent Claim
53 words
An aqueous suspension of finely divided solid particles which are maintained in suspension by a suspension stabilizing amount of a water soluble salt of polyaspartic acid in which at least 50 percent of the amino acid residue linkages are beta-linkages and having a weight average molecular weight of about 1000 to about 5,000.
Claim 3
Dependent Claim
21 words
The aqueous suspension in accordance with claim 1 wherein the polyaspartic acid contains 50 percent to about 75 percent beta linkages.
Claim 4
Dependent Claim
20 words
The aqueous suspension in accordance with claim 1 wherein the polyaspartic acid contains 60 to about 75 percent beta linkages.
Claim 5
Dependent Claim
14 words
The aqueous suspension in accordance with claim 1 wherein the particles are inorganic particles.
Claim 6
Dependent Claim
15 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are alumino-silicate particles.
Claim 7
Dependent Claim
15 words
The aqueous suspension in accordance with claim 5 wherein the alumino silicate is a zeolite.
Claim 8
Dependent Claim
15 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are clay particles.
Claim 9
Dependent Claim
13 words
The aqueous suspension in accordance with claim 7 wherein the clay is kaolin.
Claim 10
Dependent Claim
15 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are pigment particles.
Claim 11
Dependent Claim
16 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are calcium carbonate particles.
Claim 12
Dependent Claim
16 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are titanium dioxide particles.
Claim 13
Dependent Claim
15 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are silica particles.
Claim 14
Dependent Claim
16 words
The aqueous suspension in accordance with claim 4 wherein the inorganic particles are iron oxide particles.
Claim 15
Dependent Claim
18 words
The aqueous suspension in accordance with claim 1 wherein the finely divided solid particles are organic material particles.
Claim 16
Dependent Claim
15 words
The aqueous suspension in accordance with claim 1 wherein the solid particles are carbon particles.
Claim 17
Dependent Claim
15 words
The aqueous suspension in accordance with claim 1 wherein the solid particles are dirt particles.
Claim 18
Dependent Claim
17 words
The aqueous suspension in accordance with claim 1 wherein the solid particles are water insoluble polymer particles.
References Cited (Backward Citations)
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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) | 1997-02-07 | 1997-08-09 | 1998-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-07 | 2001-08-09 | 2002-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-07 | 2005-08-09 | 2006-02-08 | $7700.00 | Window Closed / Lapsed |