US3806451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the treatment of scale
Assignee: Texaco Inc
•
Filing: 1971-09-22
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Granted: 1974-04-23
•
Expires: 1991-09-22
Abstract
Abstract METHOD FOR THE TREATMENT OF SCALE, PARTICULARLY CALCIUM SULFATE SCALE, USING A WATER SOLUBLE PARTIALLY ESTERIFIED POLYPHOSPHORIC ACID HAVING A PRESCRIBED FORMULA, THE CORRESPONDING WATER SOLUBLE SALTS AND MIXTURES.
Inventors
- 👤 J Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
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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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |