US1660964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Individual
•
Filing: 1922-06-16
•
Granted: 1928-02-28
•
Expires: 1942-06-16
Abstract
No abstract record available.
Inventors
- 👤 Walter L Hartzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/14; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/7873; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7911; Y10T137/8593; Y10T137/86187; Y10T137/877; Y10T137/87708
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-02-27 | 1931-08-29 | 1932-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-02-27 | 1935-08-29 | 1936-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-02-27 | 1939-08-29 | 1940-02-28 | $7700.00 | Window Closed / Lapsed |