US2747249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making prestressed concrete articles
Assignee: Preload Co Inc
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Filing: 1952-05-14
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Granted: 1956-05-29
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Expires: 1972-05-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Chiverton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:43
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/86; B28B21/88; B28B21/56; B28B21/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF MAKING PRESTRESSED CONCRETE ARTICLES THAT COMPRISES ESTABLISHING A FIRST TENSIONED WIRE BETWEEN TWO SPACED POINTS ON A MOLDING APPARATUS DEFINING A MOLD CAVITY SO THAT SAID WIRE EXTENDS THROUGH AT LEAST A PORTION OF SAID MOLD CAVITY, ANCHORING THE ENDS OF THE WIRE IN THE MOLDING APPARATUS, MOLDING CONCRETE IN A PORTION OF SAID MOLD CAVITY TO COVER SAID WIRE, ESTABLISHING ANOTHER TENSIONED WIRE IN THE FREE PORTION OF SAID MOLD CAVITY WHICH EXTENDS THROUGH THE MOLD CAVITY IN A DIRECTION DIFFERENT FROM SAID FIRST WIRE, RESISTING THE FORCES OF SAID OTHER WIRE BY THE MOLDING APPARATUS, MOLDING CONCRETE IN THE REMAINING PORTION OF THE MOLD CAVITY, AND TRANSFERRING THE FORCES OF SAID WIRES TO THE MOLDED CONCRETE UNIFORMLY AND SIMULTANEOUSLY.
Claim 2
Independent Claim
124 words
A METHOD OF MAKING PRESTRESSED CONCRETE ARTICLES THAT COMPRISES ESTABLISHING A FIRST TENSIONED WIRE BETWEEN TWO SPACED POINTS ON A MOLDING APPARATUS DEFINING A MOLD CAVITY SO THAT SAID WIRE EXTENDS THROUGH AT LEAST A PORTION OF SAID MOLD CAVITY, ANCHORING THE ENDS OF THE WIRE IN THE MOLDING APPARATUS, MOLDING CONCRETE IN A PORTION OF SAID MOLD CAVITY TO COVER SAID WIRE, ESTABLISHING ANOTHER TENSIONED WIRE IN THE FREE PORTION OF SAID MOLD CAVITY WHICH EXTENDS THROUGH THE MOLD CAVITY IN A DIRECTION DIFFERENT FROM SAID FIRST WIRE, RESISTING THE FORCES OF SAID OTHER WIRE BY THE MOLDING APPARATUS, MOLDING CONCRETE IN THE REMAINING PORTION OF THE MOLD CAVITY, AND TRANSFERRING THE FORCES OF SAID WIRES TO THE MOLDED CONCRETE UNIFORMLY AND SIMULTANEOUSLY.
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) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |