US3497069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for water purification by ion exchange
Assignee: Corning Glass Works
•
Filing: 1968-11-01
•
Granted: 1970-02-24
•
Expires: 1988-11-01
Abstract
No abstract record available.
Inventors
- 👤 James R Lindenthal
- 👤 Richard H Winn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:10
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04; B01J39/00; B01J39/04; B01J47/026; B01J47/028; C; C02; C02F; C02F1/00; C02F1/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |