US2536075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing baked magnesium fluoride films from optical glass
Assignee: Individual
•
Filing: 1945-08-08
•
Granted: 1951-01-02
•
Expires: 1965-08-08
Abstract
No abstract record available.
Inventors
- 👤 Samuel W Macnutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:12
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS OF REMOVING BAKED MAGNESIUM FLUORIDE COATINGS ALTERNATELY AND REPEATEDLY SUBWHICH COMPRISES ALTERNATELY AND REPEATEDLY SUBJECTING EACH ELEMENT TO BE DECOATED TO SUBSTANTIALLY SATURATED SOLUTIONS OF POTASSIUM HYDROXIDE AND A CONCENTRATED SOLUTION OF NITRIC ACID AND INTERSPERSING SUCH TREATMENTS BY WASHING THE ELEMENT WITH WATER.
Claim 2
Dependent Claim
46 words
THE PROCESS OF REMOVING BAKED MAGNESIUM FLUORIDE COATINGS ALTERNATELY AND REPEATEDLY SUBWHICH COMPRISES ALTERNATELY AND REPEATEDLY SUBJECTING EACH ELEMENT TO BE DECOATED TO SUBSTANTIALLY SATURATED SOLUTIONS OF POTASSIUM HYDROXIDE AND A CONCENTRATED SOLUTION OF NITRIC ACID AND INTERSPERSING SUCH TREATMENTS BY WASHING THE ELEMENT WITH WATER.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |