US2845139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air exhausting and filtering arrangement
Assignee: THOMA CO
•
Filing: 1955-10-20
•
Granted: 1958-07-29
•
Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Berberich Helmut
- 👤 Krahschutz Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:43
CPC Classifications
D; D01; D01H; D01H11/00; D01H11/005; F; F24; F24F; F24F7/00; F24F7/04; F24F7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1794447A
Cited
US2077572A
Cited
US2116233A
Cited
US2213017A
Cited
FR1038655A
Cited
FR1058913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |