US2904857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bacteriological filter unit
Assignee: Individual
•
Filing: 1957-01-15
•
Granted: 1959-09-22
•
Expires: 1977-01-15
Abstract
No abstract record available.
Inventors
- 👤 Goetz Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
B; B01; B01D; B01D35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US202268A
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US559905A
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US636489A
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US664290A
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US659494A
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US715335A
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US813363A
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US1120229A
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US1524419A
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US2379101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |