US2502337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of fluoboric acid as a means of removing core sands from castings
Assignee: Pure Oil Co
•
Filing: 1944-09-28
•
Granted: 1950-03-28
•
Expires: 1964-09-28
Abstract
No abstract record available.
Inventors
- 👤 Harry L Moir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:44
CPC Classifications
B; B22; B22D; B22D29/00; B22D29/001; B22D29/002
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
THE METHOD OF REMOVING SILICEOUS MATERIAL FROM METAL SURFACES COMPRISING IMMERSING SAID SURFACES IN AN AQUEOUS BATH CONTAINING AT LEAST 20% BY WEIGHT OF FLUBORIC ACID, AN AMOUNT OF HYDROFLUORIC ACID LESS THAN HALF THE AMOUNT OF FLUOBORIC ACID AND A SMALL AMOUNT OF A SUBSTANCE CAPABLE OF INHIBITING THE ACTION OF THE ACIDS ON THE METAL.
References Cited (Backward Citations)
US1011203A
Cited
US1279331A
Cited
US1877504A
Cited
US2011579A
Cited
GB473556A
Cited
GB463545A
Cited
US2362875A
Cited
US2414326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |