US3394710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filtered smoking pipe
Assignee: CHANG PING CHUAN
•
Filing: 1965-08-16
•
Granted: 1968-07-30
•
Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Ping-Chuan Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
A; A24; A24F; A24F1/00; A24F1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR605316A
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GB438175A
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US2592401A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |