US3027689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for treating piezoelectric crystals
Assignee: Individual
•
Filing: 1960-10-05
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Granted: 1962-04-03
•
Expires: 1980-10-05
Abstract
No abstract record available.
Inventors
- 👤 Walter A Merkl
- 👤 Heinz P Wasshausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:54
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/005; B24B37/013; B24B37/04; B24B37/042
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |