US3365858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined heat interchanger and electrostatic precipitator
Assignee: Universal Oil Products Co
•
Filing: 1966-10-20
•
Granted: 1968-01-30
•
Expires: 1986-10-20
Abstract
No abstract record available.
Inventors
- 👤 Gaylord W Penney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/45; B03C3/455; B03C3/017
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1871166A
Cited
US2428328A
Cited
US2537558A
Cited
US2579445A
Cited
US2589463A
Cited
US2701622A
Cited
US2795401A
Cited
US2800193A
Cited
US3026964A
Cited
US2990912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |