US2688943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark arrester and smoke suppressor
Assignee: Individual
•
Filing: 1951-11-06
•
Granted: 1954-09-14
•
Expires: 1971-11-06
Abstract
No abstract record available.
Inventors
- 👤 Algot A Wickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:11
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/02; F23J15/04; Y; Y10; Y10S; Y10S261/00; Y10S261/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US600048A
Cited
CH71008A
Cited
US1450176A
Cited
US1857416A
Cited
US1866193A
Cited
US2213310A
Cited
US2594171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |