Patent US3679610A successfully refreshed from Google Patents.
US3679610A
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US
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Assignee: PQ Corp
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Filing: 1968-10-09
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Granted: 1972-07-25
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Expires: 1988-10-09
Abstract
Abstract WATER SOLUBLE GRANULES OF ALKALI METAL BASES AND SALTS CAPABLE OF FORMING 1% AQUEOUS SOLUTIONS WITH A PH GREATER THAN 11 ARE COLORED BY MIXING WITH A COLORING AGENT AND A RELATIVELY SMALL AMOUNT OF A WATER SOLUBLE, VOLATILE, POLAR HYDROGEN BONDING COMPOUND, SUCH AS AN ALCOHOL, AND ALLOWING THE COMPOUND TO EVAPORATE. IN SOME CASES WITH HYDRATED GRANULES OF ALKALI IT IS PREFERABLE TO INCLUDE A NON-VOLATILE HYDROGEN BONDABLE ORGANIC COMPOUND SUCH AS A NON-IONIC SURFACTANT.
Inventors
- 👤 Robert H Sams
- 👤 Robert W Linton
- 👤 Noboru R Horikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:33
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/10; C11D7/14; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325; C11D17/00; C11D3/00; C11D3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |