Patent US2994406A successfully refreshed from Google Patents.
US2994406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleanable gas filter
Assignee: Individual
•
Filing: 1958-06-13
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Granted: 1961-08-01
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Expires: 1978-06-13
Abstract
No abstract record available.
Inventors
- 👤 Wesley C L Hemeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:17
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B01D45/14; F; F24; F24F; F24F13/00; F24F13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1273791A
Cited
US1765720A
Cited
US1690813A
Cited
GB386094A
Cited
US1962425A
Cited
US2197004A
Cited
US2657802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |