Patent US2838740A successfully refreshed from Google Patents.
US2838740A
Expired / Lapsed
US
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Heat exchanging connector
Assignee: Individual
•
Filing: 1954-07-12
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Granted: 1958-06-10
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Larky Norbert David
- 👤 Shankweiler Ray Gernert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
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)
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US1607346A
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US1762848A
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US1913575A
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GB572161A
Cited
US2446706A
Cited
US2415404A
Cited
US2523465A
Cited
US2533483A
Cited
US2486285A
Cited
US2636067A
Cited
US2689337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |