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US2995344A
Expired / Lapsed
US
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Plate type heat exchangers
Assignee: CA Parsons and Co Ltd
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Filing: 1959-02-12
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Granted: 1961-08-08
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Expires: 1979-02-12
Abstract
No abstract record available.
Inventors
- 👤 Hryniszak Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0012; F28D9/0018; F28D9/04; F28F; F28F2250/00; F28F2250/10; F28F2250/102; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/357; Y10S165/358
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) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |