Patent US2743945A successfully refreshed from Google Patents.
US2743945A
Expired / Lapsed
US
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Heat exchanger sealing devices
Assignee: CA Parsons and Co Ltd
•
Filing: 1952-11-15
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Granted: 1956-05-01
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Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 Bentele Max
- 👤 Lowthian Charles Stewart
- 👤 Russell William Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:29
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |