US2807445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger welded tube joint
Assignee: Griscom Russell Co
•
Filing: 1954-06-16
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Granted: 1957-09-24
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Expires: 1974-06-16
Abstract
No abstract record available.
Inventors
- 👤 Karl A Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:22
CPC Classifications
F; F22; F22G; F22G3/00; F22G3/009; F28; F28F; F28F9/00; F28F9/02; F28F9/0229; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49348
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |