US2655833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dissolve type shutter for dual projection apparatus
Assignee: Individual
•
Filing: 1950-02-21
•
Granted: 1953-10-20
•
Expires: 1970-02-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Krows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:02
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/001
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR378415A
Cited
US1067750A
Cited
US1247646A
Cited
US1259365A
Cited
GB380436A
Cited
US2142183A
Cited
US2395883A
Cited
US2460864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |