US2852092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frame for electric precipitators
Assignee: Individual
•
Filing: 1955-10-17
•
Granted: 1958-09-16
•
Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Hal F Fruth
- 👤 Harry S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:37
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/86; B03C3/40; B03C3/45; B03C3/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US461446A
Cited
US1628936A
Cited
US1854650A
Cited
US1759645A
Cited
US2626008A
Cited
US2650672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |