US2439936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter by-pass valve construction
Assignee: Bendix Aviation Corp
•
Filing: 1944-08-23
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Granted: 1948-04-20
•
Expires: 1964-08-23
Abstract
No abstract record available.
Inventors
- 👤 Kasten Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:17
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/147; B01D29/00; B01D29/44; B01D29/46; B01D29/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US511798A
Cited
US1401976A
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US1619118A
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US1496947A
Cited
GB303763A
Cited
US2170074A
Cited
US2354380A
Cited
US2360020A
Cited
US2352315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |