Patent US4692335A successfully refreshed from Google Patents.
US4692335A
Expired / Lapsed
US
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Calcium hypochlorite tablet
Assignee: PPG Industries Inc
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Filing: 1985-09-03
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Granted: 1987-09-08
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Expires: 2005-09-03
Abstract
Abstract Novel solid articles comprising a compressed mixture of granular calcium hypochlorite and from about 0.5 to about 5.0 weight percent, basis the calcium hypochlorite, of solid wax binder selected from the group consisting of microcrystalline hydrocarbon wax and alkali metal salts of oxidized microcrystaline hydrocarbon wax are described. The novel solid articles are provided in the shape of, for example, tablets, which are prepared by dry blending the granular calcium hypochlorite and wax binder and feeding the mixture to a tableting press. The articles dissolve at a controlled rate, depending on the amount of binder used, in water, thereby providing a source of available chlorine over an extended period of time.
Inventors
- 👤 Donald P. Iwanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; A; A01; A01N; A01N25/00; A01N25/34; A01N59/00; C01; C01B; C01B11/00; C01B11/04; C01B11/06; C01B11/068; C02F1/68; C02F1/685; C02F1/688; C02F2103/00; C02F2103/42; C02F2303/00; C02F2303/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
A solid article comprising a compressed mixture of granular calcium hypochlorite and from about 0.5 to about 5.0 weight percent of a solid wax binder selected from the group consisting of microcrystalline hydrocarbon wax and alkali metal salts of oxidized microcrystalline hydrocarbon wax.
Claim 2
Dependent Claim
43 words
A solid article comprising a compressed mixture of granular calcium hypochlorite and from about 0.5 to about 5.0 weight percent of a solid wax binder selected from the group consisting of microcrystalline hydrocarbon wax and alkali metal salts of oxidized microcrystalline hydrocarbon wax.
Claim 3
Dependent Claim
24 words
The article of claim 1 wherein the principal size distribution of the granular calcium hypochlorite is between minus 6 and plus 100 U.S. Sieve.
Claim 4
Dependent Claim
20 words
The article of claim 2 wherein the binder is present in amounts of from about 0.75 to 1.75 weight percent.
Claim 5
Dependent Claim
17 words
The article of claim 3 wherein the binder is the potassium salt of oxidized microcrystalline hydrocarbon wax.
Claim 6
Dependent Claim
17 words
The article of claim 3 wherein the mass of the article is from 250 to 350 grams.
Claim 7
Dependent Claim
29 words
The article of claim 5 wherein the shape of the article is in the form of a tablet having a diameter of from about 3 to about 3.5 inches.
Claim 8
Dependent Claim
27 words
The article of claim 1 wherein at least 10 weight percent of the original mass of compressed calcium hypochlorite remains after 6 days of contact with water.
Claim 9
Dependent Claim
18 words
The article of claim 1 wherein the granular calcium hypochlorite is at least 65 weight percent calcium hypochlorite.
Claim 10
Dependent Claim
24 words
The article of claim 2 wherein the principal size distribution of the granular calcium hypochlorite is between minus 10 and plus 45 U.S. Sieve.
Claim 11
Dependent Claim
19 words
The article of claim 9 wherein the binder is present in amounts of from 0.75 to 1.75 weight percent.
Claim 12
Dependent Claim
21 words
The article of claim 10 wherein the density of the article is between about 1.6 and 2.3 grams per cubic centimeter.
Claim 13
Dependent Claim
24 words
The article of claim 10 wherein the principal size distribution of the granular calcium hypochlorite is between minus 6 and plus 60 U.S. Sieve.
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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) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |