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Patent US1838306A successfully refreshed from Google Patents.
US1838306A
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Assignee: National Carbon Co Inc
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Filing: 1927-10-27
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Granted: 1931-12-29
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Expires: 1947-10-27
Abstract
No abstract record available.
Inventors
- 👤 Herman G Graubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:50
CPC Classifications
G; G10; G10K; G10K5/00; F; F21; F21L; F21L2/00; F21L4/00; F21V; F21V33/00
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) | 1934-12-28 | 1935-06-29 | 1935-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-28 | 1939-06-29 | 1939-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-28 | 1943-06-29 | 1943-12-29 | $7700.00 | Window Closed / Lapsed |