US2424043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening metallic films
Assignee: Bausch and Lomb Inc
•
Filing: 1944-03-16
•
Granted: 1947-07-15
•
Expires: 1964-03-16
Abstract
No abstract record available.
Inventors
- 👤 Gerard A Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:45
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/06; C03C17/09; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/263; C03C2218/00; C03C2218/10; C03C2218/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067907A
Cited
US2322613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |