US2489681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Equipment Dev Co Inc
•
Filing: 1948-02-13
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Granted: 1949-11-29
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Expires: 1968-02-13
Abstract
No abstract record available.
Inventors
- 👤 Edmund G Smith
- 👤 Otell M Cocchiarelia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:29
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/80; B01D33/82; B01D2201/00; B01D2201/28; B01D2201/282; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86863
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1465156A
Cited
US2352330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |