US2788087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas cleaning apparatus
Assignee: Research Corp
•
Filing: 1955-04-07
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Granted: 1957-04-09
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Expires: 1975-04-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Lenehan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
B; B04; B04C; B04C9/00; B04C5/00; B04C5/08; B04C5/10; B04C2009/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |