US2048993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filter
Assignee: United Gas Improvement Co
•
Filing: 1934-11-16
•
Granted: 1936-07-28
•
Expires: 1954-11-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Claffey
- 👤 Joseph A Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:43
CPC Classifications
B; B01; B01D; B01D46/00; C; C10; C10K; C10K1/00; C10K1/02; C10K1/024; Y; Y10; Y10S; Y10S48/00; Y10S48/05
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) | 1939-07-28 | 1940-01-27 | 1940-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-07-28 | 1944-01-27 | 1944-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-07-28 | 1948-01-27 | 1948-07-28 | $7700.00 | Window Closed / Lapsed |