Patent US3439737A successfully refreshed from Google Patents.
US3439737A
Expired / Lapsed
US
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Spacer grid for heat exchange elements with mixing promotion means
Assignee: United Kingdom Atomic Energy Authority
•
Filing: 1966-11-14
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Granted: 1969-04-22
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Colin Boorman
- 👤 Colin Betts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:31
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/34; G21C3/356; G21C3/3563; F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0135; F28F9/24; G21C3/322; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB826681A
Cited
GB850021A
Cited
DE1060507B
Cited
GB874039A
Cited
US3070534A
Cited
DE1085976B
Cited
GB1014822A
Cited
US3176762A
Cited
US3281327A
Cited
US3344855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |