US1337489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regulating the velocity of fumes passing through electrical precipitators
Assignee: Research Corp
•
Filing: 1917-09-25
•
Granted: 1920-04-20
•
Expires: 1937-09-25
Abstract
No abstract record available.
Inventors
- 👤 William W Strong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:37
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/36; Y; Y10; Y10S; Y10S55/00; Y10S55/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-04-20 | 1923-10-20 | 1924-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-04-20 | 1927-10-20 | 1928-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-04-20 | 1931-10-20 | 1932-04-20 | $7700.00 | Window Closed / Lapsed |