Patent US3663448A successfully refreshed from Google Patents.
US3663448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibiting scale deposition
Assignee: Calgon Corp
•
Filing: 1970-09-25
•
Granted: 1972-05-16
•
Expires: 1990-09-25
Abstract
Abstract A METHOD OF INHIBITING SCALE FORMATION IN AQUEOUS SYSTEMS IS DISCLOSES, IN WHICH COMBINATIONS OF AMINO PHOSPHONATE COMPOUNDS AND WATER SOLUBLE POLYACRYLIC ACID DERIVATIVES ARE USED.
Inventors
- 👤 Paul Hotchkiss Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:01
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; 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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |