US3522840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A heat exchange and pressure relief device therefor
Assignee: BW IP International Inc
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Filing: 1968-12-04
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Granted: 1970-08-04
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Expires: 1988-12-04
Abstract
No abstract record available.
Inventors
- 👤 Robert S Wentworth Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/024; F28F; F28F9/00; F28F2265/00; F28F2265/12; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/407
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) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |