US2805049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube spacers
Assignee: Union Carbide Corp
•
Filing: 1954-01-27
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Granted: 1957-09-03
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Expires: 1974-01-27
Abstract
No abstract record available.
Inventors
- 👤 William A Katholi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28F9/00; F28F9/007; F28F9/013; F28F9/0131; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/416
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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |