US950491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonia-purifier for refrigerating plants.
Assignee: Individual
•
Filing: 1909-09-25
•
Granted: 1910-03-01
•
Expires: 1929-09-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick Nenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/001; B01D3/003
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) | 1913-02-28 | 1913-08-30 | 1914-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1917-02-28 | 1917-08-30 | 1918-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1921-02-28 | 1921-08-30 | 1922-03-01 | $7700.00 | Window Closed / Lapsed |