Patent US2917404A successfully refreshed from Google Patents.
US2917404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of rendering porous graphite body impervious to fluids
Assignee: KUHNLE AG
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Filing: 1956-04-30
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Granted: 1959-12-15
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Expires: 1976-04-30
Abstract
No abstract record available.
Inventors
- 👤 Melzer Wolfgang
- 👤 Schuster Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:45
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/5035; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A METHOD OF RENDERING A POROUS GRAPHITE BODY IMPERVIOUS TO FLUID MEDIA, COMPRISING THE STEPS OF DRYING SAID PORPOUS GRAPHITE BOD; IMMERSING SAID DRY GRAPHITE BODY INTO SICI4 IN THE ABSENCE OF WATER SO AS TO PREVENT HYDROLYZATION OF SAID SICI4 UNTIL AT LEAST A MAJOR PORTION OF THE PORES OF SAID GRAPHITE BODY ARE SUBSTANTIALLY FILLED WITH SAID SICL4; REMOVING SAID GRAPHITE BODY FROM SAID SICL4 THEREAFTER TREATING SAID WATER-FREE GRAPHITE BODY HAVING THE PORES THEREOF SUBSTANTIALLY FILLED WITH SICL'' WITH WATER SO AS TO HYDROLYZE SAID SUCL4, THEREBY FORMING A SILICA GEL IN THE PORES OF SAID GRAPHITE BODY; AND HEATING SAID GRAAPHITE BODY HAVING THE THUS FORMED SILICA GEL EMBEDDED IN PORES THEREOF TO A TEMPERATURE OF BETWEEN 100* C. AND 500* C. FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID SILICA GEL INTO SILICON DIOXIDE WHICH SEALS SAID PORES AND RENDERS SAID BODY IMPERVIOUS TO FLUID MEDIA.
Claim 2
Independent Claim
152 words
A METHOD OF RENDERING A POROUS GRAPHITE BODY IMPERVIOUS TO FLUID MEDIA, COMPRISING THE STEPS OF DRYING SAID PORPOUS GRAPHITE BOD; IMMERSING SAID DRY GRAPHITE BODY INTO SICI4 IN THE ABSENCE OF WATER SO AS TO PREVENT HYDROLYZATION OF SAID SICI4 UNTIL AT LEAST A MAJOR PORTION OF THE PORES OF SAID GRAPHITE BODY ARE SUBSTANTIALLY FILLED WITH SAID SICL4; REMOVING SAID GRAPHITE BODY FROM SAID SICL4 THEREAFTER TREATING SAID WATER-FREE GRAPHITE BODY HAVING THE PORES THEREOF SUBSTANTIALLY FILLED WITH SICL'' WITH WATER SO AS TO HYDROLYZE SAID SUCL4, THEREBY FORMING A SILICA GEL IN THE PORES OF SAID GRAPHITE BODY; AND HEATING SAID GRAAPHITE BODY HAVING THE THUS FORMED SILICA GEL EMBEDDED IN PORES THEREOF TO A TEMPERATURE OF BETWEEN 100* C. AND 500* C. FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID SILICA GEL INTO SILICON DIOXIDE WHICH SEALS SAID PORES AND RENDERS SAID BODY IMPERVIOUS TO FLUID MEDIA.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |