US2780309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for removing dust and other impurities from air, funnel smoke and other gases, especially gases from chemical and electrochemical manufactories
Assignee: Individual
•
Filing: 1952-06-30
•
Granted: 1957-02-05
•
Expires: 1972-06-30
Abstract
No abstract record available.
Inventors
- 👤 Loftheim Tor Bjorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:20
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B01D45/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR645477A
Cited
US1785918A
Cited
US1941449A
Cited
US2039127A
Cited
FR802652A
Cited
US2317785A
Cited
US2209607A
Cited
US2482642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |