US2674820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of smoke signs in the air
Assignee: Individual
•
Filing: 1949-12-23
•
Granted: 1954-04-13
•
Expires: 1969-12-23
Abstract
No abstract record available.
Inventors
- 👤 Hansen Rolf Krohn
- 👤 Pike Sele Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:34
CPC Classifications
G; G09; G09F; G09F21/00; G09F21/06; G09F21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1346493A
Cited
US1632106A
Cited
US1769060A
Cited
US2063354A
Cited
US2184387A
Cited
US2308060A
Cited
US2345153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |