Patent US2192529A successfully refreshed from Google Patents.
US2192529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection apparatus
Assignee: AT&T Inc
•
Filing: 1938-05-10
•
Granted: 1940-03-05
•
Expires: 1958-05-10
Abstract
No abstract record available.
Inventors
- 👤 Walter M Thomas
- 👤 Arthur W Schoof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-03-05 | 1943-09-04 | 1944-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-05 | 1947-09-04 | 1948-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-05 | 1951-09-04 | 1952-03-05 | $7700.00 | Window Closed / Lapsed |