US997171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust-collector.
Assignee: Individual
•
Filing: 1910-08-15
•
Granted: 1911-07-04
•
Expires: 1930-08-15
Abstract
No abstract record available.
Inventors
- 👤 John Conrad Zehfus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:28
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/08; B04C5/103; A; A47; A47L; A47L5/00; A47L5/12; A47L5/14
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) | 1914-07-03 | 1915-01-02 | 1915-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-07-03 | 1919-01-02 | 1919-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-07-03 | 1923-01-02 | 1923-07-04 | $7700.00 | Window Closed / Lapsed |