Patent US1540407A successfully refreshed from Google Patents.
Patent US1151663A successfully refreshed from Google Patents.
Patent US1853983A successfully refreshed from Google Patents.
Patent US1856739A successfully refreshed from Google Patents.
US1856739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection screen
Assignee: EIDP Inc
•
Filing: 1929-12-06
•
Granted: 1932-05-03
•
Expires: 1949-12-06
Abstract
No abstract record available.
Inventors
- 👤 Cornelius A Alt
- 👤 Robert A Mclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:39
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; B; B29; B29C; B29C65/00; B29C65/48; B29C65/50; B29C65/5042; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/40; B29C66/41; B29C66/43; B29C65/5007; B29C65/5028; Y; Y10; Y10T; Y10T428/00; Y10T428/19; Y10T428/192; Y10T428/197
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) | 1935-05-03 | 1935-11-02 | 1936-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-03 | 1939-11-02 | 1940-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-03 | 1943-11-02 | 1944-05-03 | $7700.00 | Window Closed / Lapsed |