US3101519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct forming core
Assignee: Flexicore Co Inc
•
Filing: 1961-11-29
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Granted: 1963-08-27
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Expires: 1981-11-29
Abstract
No abstract record available.
Inventors
- 👤 Robert E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:16
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/32; Y; Y10; Y10S; Y10S425/00; Y10S425/019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A CORE ASSEMBLY FOR DEFINING A DUCT THROUGHOUT THE LENGTH OF A CONCRETE SLAB DURING CASTING, SAID CORE ASSEMBLY HAVING A LENGTH GREAT IN COMPARISON TO ANY TRANSVERSE DIMENSIONS THEREOF, SAID CORE ASSEMBLY INCLUDING AN ELONGATED SLOTTED TUBULAR METAL MEMBER, SAID MEMBER BEING STRAIGHT AND LONG AND HAVING A TRANSVERSE SHAPE WHICH REMAINS UNIFORM THROUGHOUT THE ACTIVE LENGTH THEREOF AND IN TRANSVERSE SECTION DEFINES AN AREA WHICH IS ALMOST BUT NOT COMPLETELY SURROUNDED BY A SECTION OF SAID MEMBER SO THAT SAID MEMBER HAS A GENERALLY TUBULAR SHAPE WITH A SLOT EXTENDING THE FULL LENGTH THEREOF, A MOULDING COVERING SAID SLOT AND TENDING TO KEEP SAID SLOT CLOSED EVEN THOUGH THE SLOT WIDTH IS INCREASED BY DEFORMING SAID MEMBER, AN AIRTIGHT, FLEXIBLE TUBE WITHIN SAID MEMBER AND HAVING THE PROPERTY OF LATERAL EXPANSION IN RESPONSE TO FLUID PRESSURE, AND LATERALLY EXPANDABLE MEANS DISPOSED OVER SAID FLEXIBLE TUBE AND COUPLED TO SAID SLOTTED TUBULAR MEMBER ONLY AT REGIONS ADJACENT THE SLOT, SAID AIR-TIGHT
Claim 2
Dependent Claim
162 words
A CORE ASSEMBLY FOR DEFINING A DUCT THROUGHOUT THE LENGTH OF A CONCRETE SLAB DURING CASTING, SAID CORE ASSEMBLY HAVING A LENGTH GREAT IN COMPARISON TO ANY TRANSVERSE DIMENSIONS THEREOF, SAID CORE ASSEMBLY INCLUDING AN ELONGATED SLOTTED TUBULAR METAL MEMBER, SAID MEMBER BEING STRAIGHT AND LONG AND HAVING A TRANSVERSE SHAPE WHICH REMAINS UNIFORM THROUGHOUT THE ACTIVE LENGTH THEREOF AND IN TRANSVERSE SECTION DEFINES AN AREA WHICH IS ALMOST BUT NOT COMPLETELY SURROUNDED BY A SECTION OF SAID MEMBER SO THAT SAID MEMBER HAS A GENERALLY TUBULAR SHAPE WITH A SLOT EXTENDING THE FULL LENGTH THEREOF, A MOULDING COVERING SAID SLOT AND TENDING TO KEEP SAID SLOT CLOSED EVEN THOUGH THE SLOT WIDTH IS INCREASED BY DEFORMING SAID MEMBER, AN AIRTIGHT, FLEXIBLE TUBE WITHIN SAID MEMBER AND HAVING THE PROPERTY OF LATERAL EXPANSION IN RESPONSE TO FLUID PRESSURE, AND LATERALLY EXPANDABLE MEANS DISPOSED OVER SAID FLEXIBLE TUBE AND COUPLED TO SAID SLOTTED TUBULAR MEMBER ONLY AT REGIONS ADJACENT THE SLOT, SAID AIR-TIGHT
References Cited (Backward Citations)
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US1486204A
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US1556869A
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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) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |