Patent US3145916A successfully refreshed from Google Patents.
Patent US3300942A successfully refreshed from Google Patents.
US3300942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing natural draft cooling tower
Assignee: Dravo Corp
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Filing: 1964-02-10
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Granted: 1967-01-31
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Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 William L Horstman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:10
CPC Classifications
E; E04; E04H; E04H5/00; E04H5/10; E04H5/12; F; F28; F28C; F28C1/00; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y10; Y10S; Y10S261/00; Y10S261/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN THE METHOD OF FORMING A NATURAL DRAFT COOLING TOWER AND LIKE STRUCTURES HVING A BASE RING SUPPORTED ON THE GROUND BUT ABOVE GROUND LEVEL, THE STEPS WHICH COMPRISE PREFORMING CONCRETE PANEL SECTIONS WITH LEGS ATTACHED THERETO AND WITH GROOVED END FACES AT BOTH ENDS THEREOF, RAISING THE SECTIONS TO A POSITION WHERE THE LEGS SLOPE UPWARDLY AND INWARDLY TOWARD THE VERTICAL AXIS OF THE TOWER WITH THE ENDS OF THE SECTIONS IN CONFRONTING SPACED RELATION AND THE SECTIONS THEN FORMING A SUBSTANTIALLY CIRCULAR RING, TEMPORARILY SUPPORTING THE PANEL SECTIONS IN SUCH INCLINED POSITION WITH PROPS, ANCHORING THE LOWER ENDS OF THE LEGS TO A FOOTER, FILLING THE SPACES BETWEEN THE PANEL SECTIONS INCLUDING THE GROOVED END SURFACES WITH AN AIR-HARDENING CEMENTITIOUS MATERIAL TO FORM INTERLOCKING KEYS BETWEEN THE PANEL ENDS, AND REMOVING THE PROPS AFTER THE RING IS COMPLETED AND THE CEMENTITIOUS MATERIAL HAS HARDENED AND THEY ARE NO LONGER REQUIRED.
Claim 2
Dependent Claim
152 words
IN THE METHOD OF FORMING A NATURAL DRAFT COOLING TOWER AND LIKE STRUCTURES HVING A BASE RING SUPPORTED ON THE GROUND BUT ABOVE GROUND LEVEL, THE STEPS WHICH COMPRISE PREFORMING CONCRETE PANEL SECTIONS WITH LEGS ATTACHED THERETO AND WITH GROOVED END FACES AT BOTH ENDS THEREOF, RAISING THE SECTIONS TO A POSITION WHERE THE LEGS SLOPE UPWARDLY AND INWARDLY TOWARD THE VERTICAL AXIS OF THE TOWER WITH THE ENDS OF THE SECTIONS IN CONFRONTING SPACED RELATION AND THE SECTIONS THEN FORMING A SUBSTANTIALLY CIRCULAR RING, TEMPORARILY SUPPORTING THE PANEL SECTIONS IN SUCH INCLINED POSITION WITH PROPS, ANCHORING THE LOWER ENDS OF THE LEGS TO A FOOTER, FILLING THE SPACES BETWEEN THE PANEL SECTIONS INCLUDING THE GROOVED END SURFACES WITH AN AIR-HARDENING CEMENTITIOUS MATERIAL TO FORM INTERLOCKING KEYS BETWEEN THE PANEL ENDS, AND REMOVING THE PROPS AFTER THE RING IS COMPLETED AND THE CEMENTITIOUS MATERIAL HAS HARDENED AND THEY ARE NO LONGER REQUIRED.
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |