US2822926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross washer for hollow filter leaves
Assignee: Air Maze Corp
•
Filing: 1953-02-24
•
Granted: 1958-02-11
•
Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 George M Walton
- 👤 Richard E Brown
- 👤 George E Slater
- 👤 Harold R Sobeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:33
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/147; B01D29/00; B01D29/39; B01D29/41; B01D29/88; B01D29/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US743091A
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US1609856A
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US1989795A
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US2078524A
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FR843730A
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US2423547A
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US2444147A
Cited
US2556521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |