US3302599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermet air-sealed smokestack
Assignee: Individual
•
Filing: 1965-06-09
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Granted: 1967-02-07
•
Expires: 1985-06-09
Abstract
No abstract record available.
Inventors
- 👤 Richard E Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:06
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/28; F; F16; F16L; F16L7/00; F23; F23J; F23J13/00; F23J13/02; F23J13/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A SECTIONAL SMOKESTACK CONSTRUCTION COMPRISING PLURALITY OF HOLLOW CYLINDRICAL SMOKESTACK SECTIONS SUPERPOSED ON EACH OTHER FORMING JOINTS THEREBETWEEN, EACH SECTION INCLUDING CONCENTRIC INNER AND OUTER WALLS, EACH SECTION OF THE OUTER WALL INCLUDING A PLURALITY OF SEGMENTAL SECTIONAL PORTIONS WITH FLANGES ALONG THE LONGEDGES THEREOF, SAID FLANGES EXTENDING OUTWARDLY AND INWARDLY OF THE SECTIONAL PORTION, THE INNER EXTENDING PORTION OF THE FLANGES CONTACTING THE OUTER SURFACE OF THE INNER WALL, THE FLANGE BEING IN JUXTAPOSED POSITION, RADIAL ANNULAR FLANGE DISPOSED BETWEEN THE ADJACENT END EDGES OF THE OUTWARDLY EXTENDING PORTIONS OF THE FIRST NAMED FLANGES, STIFFENERS BETWEEN THE INNER AND OUTER WALLS ACROSS THE JOINTS BETWEEN THE SECTIONS, AND ANNULAR FLANGES ACROSS THE TOP AND BOTTOM ENDS OF THE END SECTIONS FOR SEALING OFF THE SPACE BETWEEN THE INNER AND OUTER WALLS.
Claim 2
Dependent Claim
132 words
A SECTIONAL SMOKESTACK CONSTRUCTION COMPRISING PLURALITY OF HOLLOW CYLINDRICAL SMOKESTACK SECTIONS SUPERPOSED ON EACH OTHER FORMING JOINTS THEREBETWEEN, EACH SECTION INCLUDING CONCENTRIC INNER AND OUTER WALLS, EACH SECTION OF THE OUTER WALL INCLUDING A PLURALITY OF SEGMENTAL SECTIONAL PORTIONS WITH FLANGES ALONG THE LONGEDGES THEREOF, SAID FLANGES EXTENDING OUTWARDLY AND INWARDLY OF THE SECTIONAL PORTION, THE INNER EXTENDING PORTION OF THE FLANGES CONTACTING THE OUTER SURFACE OF THE INNER WALL, THE FLANGE BEING IN JUXTAPOSED POSITION, RADIAL ANNULAR FLANGE DISPOSED BETWEEN THE ADJACENT END EDGES OF THE OUTWARDLY EXTENDING PORTIONS OF THE FIRST NAMED FLANGES, STIFFENERS BETWEEN THE INNER AND OUTER WALLS ACROSS THE JOINTS BETWEEN THE SECTIONS, AND ANNULAR FLANGES ACROSS THE TOP AND BOTTOM ENDS OF THE END SECTIONS FOR SEALING OFF THE SPACE BETWEEN THE INNER AND OUTER WALLS.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |