US1411537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making graphitized material
Assignee: Stackpole Carbon Co
•
Filing: 1921-01-26
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Granted: 1922-04-04
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Expires: 1941-01-26
Abstract
No abstract record available.
Inventors
- 👤 Alan P Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532
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) | 1925-04-03 | 1925-10-03 | 1926-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-04-03 | 1929-10-03 | 1930-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-04-03 | 1933-10-03 | 1934-04-04 | $7700.00 | Window Closed / Lapsed |