Patent US2122514A successfully refreshed from Google Patents.
US2122514A
Expired / Lapsed
US
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Air filtering material
Assignee: Arthur D Little Inc
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Filing: 1934-04-10
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Granted: 1938-07-05
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Expires: 1954-04-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Crocker
- 👤 Howard J Billings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
B; B01; B01D; B01D46/00; Y; Y10; Y10S; Y10S55/00; Y10S55/24
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) | 1941-07-04 | 1942-01-03 | 1942-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-07-04 | 1946-01-03 | 1946-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-07-04 | 1950-01-03 | 1950-07-05 | $7700.00 | Window Closed / Lapsed |