US4312673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed alkali silicate compositions for coatings and cements
Assignee: PPG Industries Inc
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Filing: 1980-04-21
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Granted: 1982-01-26
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Expires: 2000-04-21
Abstract
Abstract Water-soluble, curable silicate compositions comprising sodium silicate and potassium silicate for use as coatings or cements are disclosed.
Inventors
- 👤 James E. Neely, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:40
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C09; C09D; C09D1/00; C09D1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A method for preparing an aqueous, curable silicate composition comprising the steps of: a. reacting aluminum dihydrogen phosphate with an ammonia compound to form a reaction product; b. heating said reaction product to a sufficient temperature for a sufficient time to produce predominantly the B-form of aluminum trimetaphosphate; and c. adding said heat treated reaction product to a mixture consisting essentially of sodium silicate and potassium silicate in aqueous solution.
Claim 2
Independent Claim
70 words
A method for preparing an aqueous, curable silicate composition comprising the steps of: a. reacting aluminum dihydrogen phosphate with an ammonia compound to form a reaction product; b. heating said reaction product to a sufficient temperature for a sufficient time to produce predominantly the B-form of aluminum trimetaphosphate; and c. adding said heat treated reaction product to a mixture consisting essentially of sodium silicate and potassium silicate in aqueous solution.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein the mixture of alkali metal silicates comprises from 25 to 75 percent by weight sodium silicate and from 25 to 75 percent by weight potassium silicate.
Claim 4
Dependent Claim
42 words
The method according to claim 2, wherein the sodium silicate has a mole ratio of SiO 2 /Na 2 O between 3.1 and 4.0 and the potassium silicate has a mole ratio of SiO 2 /K 2 O between 3.3 and 4.0.
Claim 5
Dependent Claim
20 words
The method according to claim 3, wherein the ratio of silicate to phosphate is at least about 2.5:1 by weight.
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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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |