US3376028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular recuperative heat exchangers with socket members joining tube sections end to end
Assignee: Central Electricity Generating Board
•
Filing: 1966-05-23
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Granted: 1968-04-02
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Expires: 1986-05-23
Abstract
No abstract record available.
Inventors
- 👤 Leason Dennis Brigham
- 👤 Gwalter Stanley Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:02
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; F28D; F28D7/00; F28D7/0041; F28F1/00; F28F1/006; F28F21/00; F28F21/04; F28F9/007; F28F9/013; F28F9/02; F28F9/0236; F28F9/0241; F28F9/04; F28F9/16; F28D7/16; F28D7/1684; F28F2265/00; F28F2265/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB127717A
Cited
GB130471A
Cited
US1619747A
Cited
US1771160A
Cited
FR803115A
Cited
US2139367A
Cited
US3309072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |