US1056789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing ozone.
Assignee: NATIONAL AIR FILTER Co
•
Filing: 1911-08-10
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Granted: 1913-03-25
•
Expires: 1931-08-10
Abstract
No abstract record available.
Inventors
- 👤 Siegfried Held
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/10; C01B13/11; Y; Y10; Y10S; Y10S261/00; Y10S261/42
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) | 1916-03-24 | 1916-09-23 | 1917-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1920-03-24 | 1920-09-23 | 1921-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1924-03-24 | 1924-09-23 | 1925-03-25 | $7700.00 | Window Closed / Lapsed |