Patent US3696040A successfully refreshed from Google Patents.
US3696040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for removal of calcium sulfate deposits
Assignee: Champion Chemicals Inc
•
Filing: 1970-01-16
•
Granted: 1972-10-03
•
Expires: 1990-01-16
Abstract
Abstract A COMPOSITION OF MATTER SUITABLE FOR REMOVAL OF MINERAL DEPOSITS SUCH AS GYPSUM AND THE LIKE COMPRISING A SALT FORMED FROM A BASE AND AN ORGANIC ACID HAVING FROM 2 TO 12 CARBON ATOMS INCLUSIVE AND WATER. IN THE PREFERRED CASE, THE ACID IS ONE HAVING A DISSOCIATION CONSTANT OF >1.0X10-5 AND MAY BE FOR EXAMPLE GLYCOLIC ACID. THE COMPOSITION MAY FURTHER CONTAIN AN ACID OR A BASE AND A SURFACTANT.
Inventors
- 👤 Frank H Mayo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:50
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C02; C02F; C02F5/00; C02F5/08; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |