Patent US3607764A successfully refreshed from Google Patents.
US3607764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass washing compound and process
Assignee: WR Grace and Co
•
Filing: 1968-01-31
•
Granted: 1971-09-21
•
Expires: 1988-01-31
Abstract
Abstract Glassware is washed with an aqueous solution of a washing compound comprising from 25 to 75 parts alkali metal hydroxide, 5 to 25 parts alkali metal tripolyphosphate, 5 to 25 parts tetraalkali metal pyrophosphate, 5 to 25 parts of a hydroxy carboxylic acid sequesterant, from 5 to 20 parts of a glycol ether, from 0.2 to 10 parts of a nonionic polyalkoxylated surfactant, and from 0 to 25 parts of sodium carbonate. By this process, all types of typical soils found on laboratory glassware as well as permanent marking inks used in the pharmaceutical industry are removed.
Inventors
- 👤 Homer E Crotty
- 👤 Michael T Zalzal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:52
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/044; C11D1/00; C11D1/66; C11D1/72; C11D3/06; C11D3/16; C11D3/20; C11D3/2075; C11D3/2086
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
The composition of claim 1 which consists of: a. from 45 to 55 parts by weight of the hydroxide; b. from 5 to 15 parts by weight of the tripolyphosphate; c. from 5 to 15 parts by weight of the pyrophosphate; d. from 5 to 15 parts by weight of the hydroxycarboxylic acid sequesterant; e. from 5 to 15 parts by weight of the alkylene glycol alkyl ether; f. from 0.2 to 10 parts by weight of the water soluble nonionic surfactant; and g. from 0 to 25 parts by weight of sodium carbonate.
Claim 2
Dependent Claim
90 words
The composition of claim 1 which consists of: a. from 53 to 55 parts by weight of sodium hydroxide; b. from 8 to 10 parts by weight of sodium tripolyphosphate; c. from 8 to 10 parts by weight of tetrasodium pyrophosphate; d. from 8 to 10 parts by weight of sodium gluconate; e. from 5 to 8 parts by weight of ethylene glycol monobutyl ether; f. from 1 to 3 parts by weight of water soluble nonionic surfactant; and g. from 0 to 25 parts by weight of sodium carbonate.
Claim 3
Dependent Claim
16 words
An aqueous solution containing from 1 to 5 weight percent of the composition of claim 1.
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 |