US2023910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter leaf structure
Assignee: Standard Oil Co
•
Filing: 1933-02-27
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Granted: 1935-12-10
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Expires: 1953-02-27
Abstract
No abstract record available.
Inventors
- 👤 William H Bacheldor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/395; B01D29/62; B01D29/66; B01D29/661; B01D29/88; B01D29/94; B01D37/00
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) | 1938-12-09 | 1939-06-10 | 1939-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-12-09 | 1943-06-10 | 1943-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-12-09 | 1947-06-10 | 1947-12-10 | $7700.00 | Window Closed / Lapsed |