Patent US2433922A successfully refreshed from Google Patents.
US2433922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating surfaces
Assignee: American Optical Corp
•
Filing: 1942-10-15
•
Granted: 1948-01-06
•
Expires: 1962-10-15
Abstract
No abstract record available.
Inventors
- 👤 Osterberg Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:50
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB483029A
Cited
US2160981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-05 | 1951-07-07 | 1952-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-05 | 1955-07-07 | 1956-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-05 | 1959-07-07 | 1960-01-06 | $7700.00 | Window Closed / Lapsed |