US2420864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric plastic material and method of making same
Assignee: Individual
•
Filing: 1943-04-17
•
Granted: 1947-05-20
•
Expires: 1963-04-17
Abstract
No abstract record available.
Inventors
- 👤 Chilowsky Constantin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/852; H10N30/01; H10N30/09; H10N30/092; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1830328A
Cited
US1886234A
Cited
GB311055A
Cited
DE476506C
Cited
US1969379A
Cited
US1900038A
Cited
US2138036A
Cited
US2229172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |