US1961878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of tobacco smoke from air
Assignee: Frigidaire Corp
•
Filing: 1932-02-10
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Granted: 1934-06-05
•
Expires: 1952-02-10
Abstract
No abstract record available.
Inventors
- 👤 William K Gilkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; Y; Y10; Y10S; Y10S261/00; Y10S261/42
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) | 1937-06-04 | 1937-12-04 | 1938-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-04 | 1941-12-04 | 1942-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-04 | 1945-12-04 | 1946-06-05 | $7700.00 | Window Closed / Lapsed |