Patent US3009872A successfully refreshed from Google Patents.
US3009872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water softening
Assignee: Foster D Snell Inc
•
Filing: 1958-12-01
•
Granted: 1961-11-21
•
Expires: 1978-12-01
Abstract
No abstract record available.
Inventors
- 👤 Snell Foster Dee
- 👤 Lloyd I Osipow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:53
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
THE METHOD OF PROTECTING BASE-EXCHANGE WATERSOFTENING TANKS SUBJECT TO CORROSION UNDER CONDITIONS OF USE AND OTHER APPARATUS IN A BASE-EXCHANGE WATER-SOFTENING SYSTEM FROM CORROSION WHICH COMPRISES INCORPORATING INTO THE BASE-EXCHANGE WATER-SOFTENING MATERIAL CONTAINED IN THE BASE-EXCHANGE TANKS SUFFICIENT SOLID ANHYDROUS SODIUM SILICATE HAVING A RATIO OF NA2O TO SIO2 OF 1 TO 2 AND A PARTICLE SIZE BETWEEN 4 AND 200 MESH TO MAINTAIN 50 TO 100 P.P.M. OF DISSOLVED SODIUM SILICATE IN THE WATER PASSING THROUGH SAID SYSTEM SUBSTANTIALLY THROUGHOUT THE PERIOD OF THE NORMAL USEFUL LIFE OF THE WATER-SOFTENING BASE-EXCHANGE MATERIAL BETWEEN REGENERATIONS THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |