US2418845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical safety device
Assignee: Combustion Control Corp
•
Filing: 1944-03-15
•
Granted: 1947-04-15
•
Expires: 1964-03-15
Abstract
No abstract record available.
Inventors
- 👤 John A Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N5/085
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1639534A
Cited
US1994860A
Cited
US2007714A
Cited
US2122941A
Cited
US2302554A
Cited
US2306073A
Cited
US2292243A
Cited
US2360166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-14 | 1950-10-14 | 1951-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-14 | 1954-10-14 | 1955-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-14 | 1958-10-14 | 1959-04-15 | $7700.00 | Window Closed / Lapsed |