US3607742A
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Method and composition for phosphate removal
Assignee: WILLIAM C STEIGERWALD JR
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Filing: 1969-06-30
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Granted: 1971-09-21
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Expires: 1989-06-30
Abstract
Abstract Composition for removing phosphate content of raw sewage and waste comprising a solution of sodium hydroxide, aluminum hydrate, unmodified starch and water. Method of applying such composition.
Inventors
- 👤 William C Steigerwald Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/5263; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
The reagent as set forth in claim 1 wherein said constituents are present in approximately the following amounts: ConstituentAmount in GramsCaustic soda25Aluminum hydrate25Unmodified starch2Waterbalance
Claim 2
Dependent Claim
15 words
The reagent as set forth in claim 1 wherein said unmodified starch is potato starch.
Claim 3
Dependent Claim
15 words
The reagent as set forth in claim 1 wherein said unmodified starch is corn starch.
Claim 4
Dependent Claim
28 words
The reagent as set forth in claim 1 wherein said unmodified starch is selected from the group consisting of rice starch, wheat starch, arrowroot starch and tapioca starch.
Claim 5
Independent Claim
62 words
A method of removing phosphate ions from a water system comprising the step of applying to said water system a reagent comprising a solution consisting essentially of the following approximate range of constituents per 100 grams of solution: ConstituentRange in GramsCaustic soda (NaOH)24-30Aluminum hydrate (A1(OH)3)24-30Unmodified starch1- 4Waterbalance said unmodified starch being a starch which is untreated by an acid or a base.
Claim 6
Dependent Claim
24 words
The method as set forth in claim 6 wherein said constituents are present in approximately the following amounts: ConstituentAmount in GramsCaustic soda25Aluminum hydrate25Unmodified starch2Waterbalance
Claim 7
Dependent Claim
15 words
The method as set forth in claim 6 wherein said unmodified starch is potato starch.
Claim 8
Dependent Claim
15 words
The method as set forth in claim 6 wherein said unmodified starch is corn starch.
Claim 9
Dependent Claim
28 words
The method as set forth in claim 6 wherein said unmodified starch is selected from the group consisting of rice starch, wheat starch, arrowroot starch and tapioca starch.
Claim 10
Independent Claim
98 words
A method of preparing a solution of caustic soda, aluminum hydrate, unmodified starch and water comprising the steps of: a. mixing with agitation of about 24-30 grams caustic soda, about 24-30 grams aluminum hydrate and about 1-4 grams of unmodified starch with a sufficient amount of water to produce a 100-gram solution, said unmodified starch being a starch which is untreated by an acid or a base, b. heating the resulting mixture to approximately 225* F., c. cooling the mixture to approximately 125* F., and d. agitating the mixture at approximately 125* F. to produce a homogeneous solution.
Claim 11
Dependent Claim
48 words
The method as set forth in claim 11 wherein the starch is added in two approximately equal portions, the first portion being added before said mixture is allowed to cool to 125* F. and the second portion being added after said solutIon has been cooled to 125* F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |