Patent US4417100A successfully refreshed from Google Patents.
US2305877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the production of sparking plug insulators
Assignee: Individual
•
Filing: 1939-06-30
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Granted: 1942-12-22
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Expires: 1959-06-30
Abstract
No abstract record available.
Inventors
- 👤 Klingler Emil
- 👤 Weitbrecht Gerhard
- 👤 Dreher Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:23
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/24
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) | 1945-12-21 | 1946-06-22 | 1946-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-21 | 1950-06-22 | 1950-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-21 | 1954-06-22 | 1954-12-22 | $7700.00 | Window Closed / Lapsed |