US3429442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized device for water treatment
Assignee: Czech Academy of Sciences
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Filing: 1964-09-24
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Granted: 1969-02-25
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Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 Svatopluk Mackrle
- 👤 Vladimir Mackrle
- 👤 Oldrich Dracka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:42
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; B; B01; B01D; B01D21/00; B01D24/00; B01D24/002; B01D24/02; B01D24/10; B01D24/16; B01D24/165; B01D24/38; B01D24/40; B01D24/402; B01D24/46; B01D24/4631; B01D36/00; B01D36/001; B01D36/04
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |