Patent US2442768A successfully refreshed from Google Patents.
US2442768A
Expired / Lapsed
US
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Method of conditioning water
Assignee: Dearborn Chemical Co
•
Filing: 1939-11-24
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Granted: 1948-06-08
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Expires: 1959-11-24
Abstract
No abstract record available.
Inventors
- 👤 Lewis O Gunderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:25
CPC Classifications
B; B01; B01B; B01B1/00; B01B1/02; B01B1/04
Claims Analysis
Total Claims: 0
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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) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |