US3167882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for and method of prestressing concrete
Assignee: FMC Corp
•
Filing: 1960-12-14
•
Granted: 1965-02-02
•
Expires: 1980-12-14
Abstract
No abstract record available.
Inventors
- 👤 John A Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2976
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A COMPOSITE ROD FOR APPLYING COMPRESSIVE STRESS TO CONCRETE IN WHICH THE ROD IS CAST, COMPRISING AN ELONGATE, THERMALLY CONDUCTIVE ELEMENT FORMED OF A MATERIAL HAVING A HIGH COMPRESSIVE STRENGTH, A CONCRETE COMPRESSING ELEMENT EXTENDING ALONG SAID FIRST NAMED ELEMENT AND BEING FORMED OF A MATERIAL HAVING A HIGH MODULUS OF ELASTICITY, AND A BONDING AGENT BONDING SAID ELEMENTS TOGETHER SUBSTANTIALLY ALONG THEIR ENTISE LENGTH, SAID FIRST NAMED ELEMENT BEING UNDER COMPRESSION AND MAINTAINING THE CONCRETE COMPRESSING ELEMENT UNDER TENSION WHILE THE ELEMENTS ARE BONDED TOGETHER, SAID BONDING AGENT BEING OF A TYPE THAT FORMS A BOND WHICH IS SUBSTANTIALLY WEAKENED BY THE APPLICATION OF HEAT TO THE COMPRESSED ELEMENT FOR TRANSFERRING THE RESTORING FORCE OF SAID CONCRETE COMPRESSING ELEMENT FROM THE COMPRESSED ELEMENT TO THE CONCRETE IN WHICH THE ROD IS CAST, SAID CONCRETE COMPRESSING ELEMENT BEING FORMED WITH EXTERNAL CONCRETE GRIPPING MEANS.
Claim 2
Dependent Claim
144 words
A COMPOSITE ROD FOR APPLYING COMPRESSIVE STRESS TO CONCRETE IN WHICH THE ROD IS CAST, COMPRISING AN ELONGATE, THERMALLY CONDUCTIVE ELEMENT FORMED OF A MATERIAL HAVING A HIGH COMPRESSIVE STRENGTH, A CONCRETE COMPRESSING ELEMENT EXTENDING ALONG SAID FIRST NAMED ELEMENT AND BEING FORMED OF A MATERIAL HAVING A HIGH MODULUS OF ELASTICITY, AND A BONDING AGENT BONDING SAID ELEMENTS TOGETHER SUBSTANTIALLY ALONG THEIR ENTISE LENGTH, SAID FIRST NAMED ELEMENT BEING UNDER COMPRESSION AND MAINTAINING THE CONCRETE COMPRESSING ELEMENT UNDER TENSION WHILE THE ELEMENTS ARE BONDED TOGETHER, SAID BONDING AGENT BEING OF A TYPE THAT FORMS A BOND WHICH IS SUBSTANTIALLY WEAKENED BY THE APPLICATION OF HEAT TO THE COMPRESSED ELEMENT FOR TRANSFERRING THE RESTORING FORCE OF SAID CONCRETE COMPRESSING ELEMENT FROM THE COMPRESSED ELEMENT TO THE CONCRETE IN WHICH THE ROD IS CAST, SAID CONCRETE COMPRESSING ELEMENT BEING FORMED WITH EXTERNAL CONCRETE GRIPPING MEANS.
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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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |