US2487437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode gaseous discharge tube
Assignee: Canadian Radium and Uranium Corp
•
Filing: 1943-11-23
•
Granted: 1949-11-08
•
Expires: 1963-11-23
Abstract
No abstract record available.
Inventors
- 👤 Goldstein Ladislas
- 👤 Perrin Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:01
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE612049C
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US733423A
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GB266480A
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GB356672A
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US1966083A
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US1917739A
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US1901558A
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US1937389A
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US2020731A
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US2103439A
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US2230298A
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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) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |