US805237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning air-screen valve.
Assignee: Individual
•
Filing: 1905-02-18
•
Granted: 1905-11-21
•
Expires: 1925-02-18
Abstract
No abstract record available.
Inventors
- 👤 Willard T Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:39
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; Y; Y10; Y10T; Y10T137/00; Y10T137/794; Y10T137/8122; Y10T137/8593; Y10T137/86493; Y10T137/86501; Y10T137/86718
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) | 1908-11-20 | 1909-05-22 | 1909-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-11-20 | 1913-05-22 | 1913-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-11-20 | 1917-05-22 | 1917-11-21 | $7700.00 | Window Closed / Lapsed |