Patent US3431392A successfully refreshed from Google Patents.
US3431392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally heated crystal devices
Assignee: Raytheon Co
•
Filing: 1967-01-13
•
Granted: 1969-03-04
•
Expires: 1987-01-13
Abstract
No abstract record available.
Inventors
- 👤 William J Garland
- 👤 Lloyd J Hassencahl
- 👤 Donald D Lenhart
- 👤 George Wolfe Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:08
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/08; H05; H05B; H05B3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |