Patent US3234640A successfully refreshed from Google Patents.
US3234640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making shielding for high temperature furnace
Assignee: Individual
•
Filing: 1964-08-28
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Granted: 1966-02-15
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 John G Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:04
CPC Classifications
F; F27; F27B; F27B5/00; F27B5/04; F27D; F27D1/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4935; Y10T29/496; Y10T29/49789; Y10T29/49796; Y10T29/49826; Y10T29/49879; Y10T29/49947; Y10T29/49963; Y10T29/49964
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD OF FORMING FROM A CYLINDER OF GRAPHITE A CYLINDRICAL GRAPHITE SHIELD ASSEMBLY FOR PROVIDING HEAT RADIATION SHIELDING AROUND AN ELECTRIC RESISTANCE HEATING TUBE COMPRISING THE STEPS OF CUTTING A RADIAL SLOT THROUGHOUT THE LENGTH OF A CYLINDER OF GRAPHITE, MAKING A PLURALITY OF RADIALLY SPACED CIRCUMFERENTIAL CUTS IN SAID CYLINDER OF GRAPHITE STARTING EACH CUT IN SAID RADIAL SLOT AND CONTINUING CIRCUMFERENTIALLY RELATIVE TO THE CYLINDER AXIS UNIT ARRIVING BACK AT SAID SLOT SO AS TO FORM A PLURALITY OF CONCENTRIC CYLINDRICAL SLEEVES, REORIENTING SAID SLEEVES ABOUT THEIR COMMON AXIS SO THAT THE SLOTS THEREIN ARE IN STAGGERED RELATION, FORMING TAPPED HOLES IN RADIAL DIRECTIONS THROUGH SAID SLEEVES WHILE IN THEIR REORIENTED POSITIONS, AND SCREWING GRAPHITE STUDS INTO SAID TAPPED HOLES.
Claim 2
Independent Claim
123 words
A METHOD OF FORMING FROM A CYLINDER OF GRAPHITE A CYLINDRICAL GRAPHITE SHIELD ASSEMBLY FOR PROVIDING HEAT RADIATION SHIELDING AROUND AN ELECTRIC RESISTANCE HEATING TUBE COMPRISING THE STEPS OF CUTTING A RADIAL SLOT THROUGHOUT THE LENGTH OF A CYLINDER OF GRAPHITE, MAKING A PLURALITY OF RADIALLY SPACED CIRCUMFERENTIAL CUTS IN SAID CYLINDER OF GRAPHITE STARTING EACH CUT IN SAID RADIAL SLOT AND CONTINUING CIRCUMFERENTIALLY RELATIVE TO THE CYLINDER AXIS UNIT ARRIVING BACK AT SAID SLOT SO AS TO FORM A PLURALITY OF CONCENTRIC CYLINDRICAL SLEEVES, REORIENTING SAID SLEEVES ABOUT THEIR COMMON AXIS SO THAT THE SLOTS THEREIN ARE IN STAGGERED RELATION, FORMING TAPPED HOLES IN RADIAL DIRECTIONS THROUGH SAID SLEEVES WHILE IN THEIR REORIENTED POSITIONS, AND SCREWING GRAPHITE STUDS INTO SAID TAPPED HOLES.
References Cited (Backward Citations)
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US1279146A
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US1540401A
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US2179057A
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US2476916A
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US2964389A
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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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |