US2215267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas treater
Assignee: Research Corp
•
Filing: 1938-11-22
•
Granted: 1940-09-17
•
Expires: 1958-11-22
Abstract
No abstract record available.
Inventors
- 👤 Carl W J Hedberg
- 👤 Louis N Bonacci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:56
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/70
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) | 1943-09-17 | 1944-03-18 | 1944-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-17 | 1948-03-18 | 1948-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-17 | 1952-03-18 | 1952-09-17 | $7700.00 | Window Closed / Lapsed |