US2434201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for multiprogram projectors
Assignee: Individual
•
Filing: 1944-02-23
•
Granted: 1948-01-06
•
Expires: 1964-02-23
Abstract
No abstract record available.
Inventors
- 👤 Mary A Engelken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:00
CPC Classifications
G; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US637904A
Cited
US890936A
Cited
US918884A
Cited
US1084651A
Cited
US1405884A
Cited
US1412110A
Cited
US1915613A
Cited
US2002352A
Cited
US2101890A
Cited
US2075989A
Cited
US2136322A
Cited
US2175185A
Cited
US2109627A
Cited
USRE22707E
Cited
US2227259A
Cited
US2196730A
Cited
US2206134A
Cited
US2214468A
Cited
US2256739A
Cited
US2318118A
Cited
US2269952A
Cited
US2322489A
Cited
US2330036A
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 |