US2452928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of water
Assignee: Mathieson Chemical Corp
•
Filing: 1945-05-23
•
Granted: 1948-11-02
•
Expires: 1965-05-23
Abstract
No abstract record available.
Inventors
- 👤 Clifford A Hampel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324118A
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GB189804917A
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GB191303529A
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US1197640A
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GB191419722A
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GB191422048A
Cited
US1229305A
Cited
US1750561A
Cited
US1866524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |