Patent US3138434A successfully refreshed from Google Patents.
US3138434A
Expired / Lapsed
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Deposition method of forming a pyrolytic graphite article
Assignee: General Electric Co
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Filing: 1961-04-26
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Granted: 1964-06-23
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 Russell J Diefendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/522
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A DEPOSITION METHOD WHICH COMPRISES PROVIDING AN ENCLOSURE, POSITIONING A MEMBER WITHIN SAID ENCLOSURE, PROVIDING A NARROW, SUBSTANTIALLY UNIFORM DIAMETER PASSAGE BETWEEN SAID MEMBER AND SAID ENCLOSURE THEREBY PROVIDING A NEGLIGIBLE PRESSURE DROP DURING DEPOSITION, EVACUATING SAID PASSAGE, APPLYING A POTENTIAL BETWEEN SAID ENCLOSURE AND SAID MEMBER TO PRODUCE A CONSTANT TEMPERATURE AT THE SURFACE OF SAID ENCLOSSURE AND A CONSTANT TEMPERATURE AT THE SURFACE OF SAID MEMBER, FLOWING A CARBON VAPOR AT A TEMPERATURE IN THE RANGE OF 2000*C. TO 2500*C. THROUGH SAID PASSAGE WHEREBY A PYROLYTIC GRAPHITE ARTICLE IS FORMED ON SAID MEMBER, AND REMOVING SAID ARTICLE FROM SAID MEMBER.
Claim 2
Dependent Claim
102 words
A DEPOSITION METHOD WHICH COMPRISES PROVIDING AN ENCLOSURE, POSITIONING A MEMBER WITHIN SAID ENCLOSURE, PROVIDING A NARROW, SUBSTANTIALLY UNIFORM DIAMETER PASSAGE BETWEEN SAID MEMBER AND SAID ENCLOSURE THEREBY PROVIDING A NEGLIGIBLE PRESSURE DROP DURING DEPOSITION, EVACUATING SAID PASSAGE, APPLYING A POTENTIAL BETWEEN SAID ENCLOSURE AND SAID MEMBER TO PRODUCE A CONSTANT TEMPERATURE AT THE SURFACE OF SAID ENCLOSSURE AND A CONSTANT TEMPERATURE AT THE SURFACE OF SAID MEMBER, FLOWING A CARBON VAPOR AT A TEMPERATURE IN THE RANGE OF 2000*C. TO 2500*C. THROUGH SAID PASSAGE WHEREBY A PYROLYTIC GRAPHITE ARTICLE IS FORMED ON SAID MEMBER, AND REMOVING SAID ARTICLE FROM SAID MEMBER.
References Cited (Backward Citations)
GB274883A
Cited
US281065A
Cited
US1352086A
Cited
US1897933A
Cited
US2261319A
Cited
GB550379A
Cited
US2893895A
Cited
US2911287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |