Patent US4457847B2 successfully refreshed from Google Patents.
US4457847B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylate polymers for internal scale control agents in boiler systems
Assignee: ChampionX LLC
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Filing: 1982-05-28
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Granted: 1996-12-31
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Expires: 2002-05-28
Abstract
No abstract record available.
Inventors
- 👤 Walter F Lorenc
- 👤 John G Kelly
- 👤 Frederick S Mandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:29
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 0
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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) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-31 | 2004-07-01 | 2004-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-31 | 2008-07-01 | 2008-12-31 | $7700.00 | Window Closed / Lapsed |