US1948382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resisting carbon article
Assignee: National Carbon Co Inc
•
Filing: 1931-09-02
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Granted: 1934-02-20
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Expires: 1951-09-02
Abstract
No abstract record available.
Inventors
- 👤 Harry V Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/04; Y; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/904; Y10S376/905; Y10T; Y10T428/00; Y10T428/26; Y10T428/30
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) | 1937-02-19 | 1937-08-21 | 1938-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-02-19 | 1941-08-21 | 1942-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-02-19 | 1945-08-21 | 1946-02-20 | $7700.00 | Window Closed / Lapsed |