US2836346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure exchangers
Assignee: JENDRASSIK DEVELOPMENTS Ltd
•
Filing: 1956-06-15
•
Granted: 1958-05-27
•
Expires: 1976-06-15
Abstract
No abstract record available.
Inventors
- 👤 Andre G T Boszormenyi
- 👤 Jendrassik Clara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:15
CPC Classifications
F; F04; F04F; F04F13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1859264A
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US1955799A
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US2067757A
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US2291273A
Cited
US2675173A
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US2738123A
Cited
US2687843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |