US3445250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision metal casting molds comprising alumina coated silica and a refractory
Assignee: ChampionX LLC
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Filing: 1967-02-28
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Granted: 1969-05-20
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Richard E Preece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:12
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/183; B22C1/165; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |