US1809646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating gases
Assignee: Beazer East Inc
•
Filing: 1927-10-01
•
Granted: 1931-06-09
•
Expires: 1947-10-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick W Sperr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:21
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; Y; Y10; Y10S; Y10S261/00; Y10S261/72
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) | 1934-06-08 | 1934-12-08 | 1935-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-08 | 1938-12-08 | 1939-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-08 | 1942-12-08 | 1943-06-09 | $7700.00 | Window Closed / Lapsed |