US1653272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying water
Assignee: GEN ZEOLITE Co
•
Filing: 1921-12-09
•
Granted: 1927-12-20
•
Expires: 1941-12-09
Abstract
No abstract record available.
Inventors
- 👤 Walter H Green
- 👤 Abraham S Behrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:34
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/02
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) | 1930-12-19 | 1931-06-20 | 1931-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-12-19 | 1935-06-20 | 1935-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-12-19 | 1939-06-20 | 1939-12-20 | $7700.00 | Window Closed / Lapsed |