US2729302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filter
Assignee: American Air Filter Co Inc
•
Filing: 1949-02-11
•
Granted: 1956-01-03
•
Expires: 1969-02-11
Abstract
No abstract record available.
Inventors
- 👤 Ronald G True
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1566607A
Cited
US1059253A
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US1990110A
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US2064651A
Cited
US2058669A
Cited
US2013038A
Cited
US2297601A
Cited
US2408158A
Cited
US2637766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |