US1872497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming mica-insulated spark plugs
Assignee: Delco Electronics LLC
•
Filing: 1928-12-07
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Granted: 1932-08-16
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Expires: 1948-12-07
Abstract
No abstract record available.
Inventors
- 👤 Rabezzana Hector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:56
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49909; Y10T29/49913; Y10T29/49925; Y10T29/49927; Y10T29/49929; Y10T29/49934; Y10T29/53; Y10T29/5313; Y10T29/5327
Claims Analysis
Total Claims: 0
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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) | 1935-08-16 | 1936-02-15 | 1936-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-16 | 1940-02-15 | 1940-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-16 | 1944-02-15 | 1944-08-16 | $7700.00 | Window Closed / Lapsed |