US2852915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in pressure exchanger scavenging
Assignee: JENDRASSIK DEVELOPMENTS Ltd
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Filing: 1952-05-08
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Granted: 1958-09-23
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Expires: 1972-05-08
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 19:10
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/32; F02B33/42; F02C; F02C3/00; F02C3/02; F04; F04F; F04F13/00
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |