US3489159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for pressurizing and depressurizing of fluids
Assignee: SIN WANG CHENG
•
Filing: 1965-08-18
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Granted: 1970-01-13
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Expires: 1985-08-18
Abstract
No abstract record available.
Inventors
- 👤 Chen-Yen Cheng
- 👤 Sin-Wang Cheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:47
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/04; B01D; B01D61/00; B01D61/02; B01D61/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0396; Y10T137/8593; Y10T137/86187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3005417A
Cited
US3090325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |