Patent US3671440A successfully refreshed from Google Patents.
US3671440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of cleaning
Assignee: Chemed Corp
•
Filing: 1970-01-16
•
Granted: 1972-06-20
•
Expires: 1990-01-16
Abstract
Abstract Concentrates of liquid chlorine containing machine dishwashing compositions are disclosed which include alkali metal hydroxide, a tetra-alkali metal pyrophosphate, a water-soluble polymer, an alkali metal hypochlorite and an aqueous carrier liquid or vehicle. These concentrates have improved long lasting hard water tolerance. Cooking and eating utensils may be cleaned by dilute solutions of the present machine dishwashing compositions in water having hardness as high as 20 grains per gallon or more with less spotting and greater clarity.
Inventors
- 👤 Philip M Sabatelli
- 👤 Edwin R Loder
- 👤 Charles A Brungs
- 👤 Carmen R Sarge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3956; C11D7/00; C11D7/02; C11D7/04; C11D7/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
The process of claim 1 wherein the alkali metal hydroxide is potassium hydroxide, the tetra-alkali metal pyrophosphate is tetra-potassium pyrophosphate, the alkali metal hypochlorite is sodium hypochlorite, and the water-soluble acrylic polymer is the sodium salt of a polyacrylic acid having a molecular weight of about 80,000 to 100,000.
Claim 2
Dependent Claim
101 words
The process of claim 1 wherein a. the alkali metal hydroxide is present in an amount from about 10 to about 20 parts by weight, b. the tetra-alkali metal pyrophosphate is present in an amount from about 5 to about 15 parts by weight, c. the alkali metal hypochlorite is present in an amount from about 0.5 to about 5.0 parts by weight, d. the water-soluble acrylic polymer is present in an amount from about 1 to about 8 parts by weight, and e. the aqueous vehicle is present in an amount from about 50 to about 75 parts by weight.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the Step (A) addition is about 0.3 weight percent of said liquid dishwashing concentrate which is added to said water.
Claim 4
Dependent Claim
48 words
The process of claim 3 wherein the alkali metal hydroxide is potassium hydroxide, the tetra-alkali metal pyrophosphate is tetra-potassium pyrophosphate, the alkali metal hypochlorite is sodium hypochlorite, and the water-soluble acrylic polymer is the sodium salt of polyacrylic acid having a molecular weight of about 80,000 to 100,000.
Claim 5
Dependent Claim
45 words
The process of claim 5 wherein there is about 73.8 weight percent deionized water and, on a dry weight basis, about 14.7 weight percent potassium hydroxide, about 6 weight percent tetra-potassium pyrophosphate, about 3 weight percent sodium hypochlorite and about 2.5 weight percent sodium polyacrylate.
References Cited (Backward Citations)
US3058917A
Cited
US3308067A
Cited
US3380922A
Cited
US3393153A
Cited
US3468803A
Cited
US3535258A
Cited
US3579455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |