Patent US2997744A successfully refreshed from Google Patents.
US2997744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of graphite preparation
Assignee: Individual
•
Filing: 1957-09-19
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Granted: 1961-08-29
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Expires: 1977-09-19
Abstract
No abstract record available.
Inventors
- 👤 Stephen D Stoddard
- 👤 Wallace T Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C01; C01B; C01B32/00; Y; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/904; Y10S376/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |