US3721626A
Expired / Lapsed
US
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Descaling method and composition of alkali metal hydroxide
Assignee: Valcovny Plechu N P
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Filing: 1969-02-03
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Granted: 1973-03-20
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Expires: 1989-02-03
Abstract
Abstract A CONCENTRATE FOR USE IN ALKALINE DESCALING BATHS IS FORMED OF ALKALI METAL HYDRIDE AND ALKALI METAL OXIDE AS ACTIVE DESCALING CONSTITUENTS, DISPERSED OR DISSOVLED IN ALKALI METAL HYDROXIDE, THE LATTER BEING PRESENT IN A SUFFICIENT AMOUNT TO PASSIVATE THE ACTIVE DESCALING CONSTITUENTS PRIOR TO INTRODUCTION OF THE CONCENTRATE INTO THE DESCALING BATH. GENERALLY ALKALI WILL BE SOIDUM.
Inventors
- 👤 M Stanek
- 👤 J Mostecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:18
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/28
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |