US2488807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing end plates of heat exchangers
Assignee: Individual
•
Filing: 1946-10-26
•
Granted: 1949-11-22
•
Expires: 1966-10-26
Abstract
No abstract record available.
Inventors
- 👤 Donald H Currie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:08
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0236; F28F9/0241; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1638; F28F9/007; F28F9/013; F28F9/0131; F28F9/0132; Y; Y10; Y10S; Y10S285/00; Y10S285/918
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) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |