US2986526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal cleaning
Assignee: ChampionX LLC
•
Filing: 1957-05-16
•
Granted: 1961-05-30
•
Expires: 1977-05-16
Abstract
No abstract record available.
Inventors
- 👤 Joan T Crowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:00
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2508035A
Cited
US2746929A
Cited
US2213477A
Cited
GB490285A
Cited
GB683383A
Cited
US2618606A
Cited
US2733215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |