US2911200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube sheet joint construction
Assignee: Griscom Russell Co
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Filing: 1957-03-28
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Granted: 1959-11-03
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Expires: 1977-03-28
Abstract
No abstract record available.
Inventors
- 👤 Karl A Gardner
- 👤 Jr Raymond Gardner
- 👤 Jr Frank Boni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:06
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |