US1777957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-purifying apparatus
Assignee: FIRM DEUTSCHE ERDOL AG
•
Filing: 1927-03-25
•
Granted: 1930-10-07
•
Expires: 1947-03-25
Abstract
No abstract record available.
Inventors
- 👤 Bomcke Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:19
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/0211; F01N13/00; F01N13/009; F01N13/0097; F01N2330/00; F01N2330/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1933-10-06 | 1934-04-07 | 1934-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-06 | 1938-04-07 | 1938-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-06 | 1942-04-07 | 1942-10-07 | $7700.00 | Window Closed / Lapsed |