US2837412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of impervious graphite by liquid phase impregnation
Assignee: Individual
•
Filing: 1956-12-18
•
Granted: 1958-06-03
•
Expires: 1976-12-18
Abstract
No abstract record available.
Inventors
- 👤 George A Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:53
CPC Classifications
G; G21; G21C; G21C5/00; G21C5/12; G21C5/126; C; C01; C01B; C01B32/00; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
AN IMPROVED METHOD OF INCREASING THE DENSITY AND IMPERVOUSNESS OF GRAPHITE, WHICH COMPRISES SATURATING SAID GRAPHITE WITH A LIQUID FURAN RING COMPOUND CONSISTING OF CARBON, HYDROGEN AND OXYGEN, CONTACTING THE RESULTING IMPREGNATED GRAPHITE WITH AQUEOUS HYDROFLUORIC ACID AND THEN DRYING THE RESULTING TREATED GRAPHITE.
Claim 2
Dependent Claim
44 words
AN IMPROVED METHOD OF INCREASING THE DENSITY AND IMPERVOUSNESS OF GRAPHITE, WHICH COMPRISES SATURATING SAID GRAPHITE WITH A LIQUID FURAN RING COMPOUND CONSISTING OF CARBON, HYDROGEN AND OXYGEN, CONTACTING THE RESULTING IMPREGNATED GRAPHITE WITH AQUEOUS HYDROFLUORIC ACID AND THEN DRYING THE RESULTING TREATED GRAPHITE.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |