Patent US1109997A successfully refreshed from Google Patents.
US1109997A
Expired / Lapsed
US
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Air-purifying apparatus.
Assignee: PNEUMATIC CONVEYOR Co
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Filing: 1912-05-27
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Granted: 1914-09-08
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Expires: 1932-05-27
Abstract
No abstract record available.
Inventors
- 👤 Guido E Lob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:10
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1917-09-07 | 1918-03-09 | 1918-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1921-09-07 | 1922-03-09 | 1922-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1925-09-07 | 1926-03-09 | 1926-09-08 | $7700.00 | Window Closed / Lapsed |