US3521705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange structure and electron tube including such heat exchange structure
Assignee: Compagnie Francaise Thomson Houston SA
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Filing: 1968-06-12
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Granted: 1970-07-28
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Expires: 1988-06-12
Abstract
No abstract record available.
Inventors
- 👤 Charles Alphonse Beurtheret
- 👤 Eugene Jean Douguet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:59
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28D; F28D5/00; H; H01; H01J; H01J19/00; H01J19/28; H01J19/32; H01J19/36; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3235004A
Cited
US3367415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |