Patent US1689690A successfully refreshed from Google Patents.
US1689690A
Expired / Lapsed
US
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Attachment for spark plugs
Assignee: CHARLES J BLUE
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Filing: 1927-02-24
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Granted: 1928-10-30
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Expires: 1947-02-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Sandin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:18
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/06
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) | 1931-10-30 | 1932-04-30 | 1932-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-10-30 | 1936-04-30 | 1936-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-10-30 | 1940-04-30 | 1940-10-30 | $7700.00 | Window Closed / Lapsed |