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US2449880A
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Assignee: DUROTEST CORP
•
Filing: 1945-05-16
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Granted: 1948-09-21
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Expires: 1965-05-16
Abstract
No abstract record available.
Inventors
- 👤 James L Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:20
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21150E
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US966204A
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FR605242A
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US1698691A
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US2182732A
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US2118452A
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US2030439A
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US2117544A
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US2225495A
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US2184530A
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US2355117A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |