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US737579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying gas.
Assignee: Individual
•
Filing: 1902-12-06
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Granted: 1903-09-01
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Expires: 1922-12-06
Abstract
No abstract record available.
Inventors
- 👤 Ernst Burschell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52
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) | 1906-08-31 | 1907-03-02 | 1907-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-08-31 | 1911-03-02 | 1911-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-08-31 | 1915-03-02 | 1915-09-01 | $7700.00 | Window Closed / Lapsed |