Patent US3233027A successfully refreshed from Google Patents.
US3233027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making prestressed concrete beams
Assignee: Individual
•
Filing: 1961-12-27
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Granted: 1966-02-01
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Expires: 1981-12-27
Abstract
No abstract record available.
Inventors
- 👤 Wennstrom Elof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:09
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR MAKING PRESTRESSED CONCRETE BEAMS COMPRISING POURING CONCRETE INTO A MOLD HAVING END WALL MEMBERS LOCATED IN SAID MOLD WITH REINFORCING RODS EXTENDING BETWEEN SAID END WALL MEMBERS, PLACING SAID END WALL MEMBERS AND REINFORCING RODS UNDER STRESS BY A STRESSING ELEMENT REMOVABLY ATTACHED TO SAID END WALL MEMBERS, INVERTING SAID MOLD PRIOR TO FINAL SETTING OF SAID CONCRETE AND REMOVING THE MOLD BUT NOT SAID END WALL MEMBERS FROM THE CONCRETE BEAM FORMED, THEN REMOVING SAID STRESSING ELEMENT FORM SAID END WALL MEMBERS AND ALLOWING THE CONCRETE TO FINALLY SET.
Claim 2
Independent Claim
93 words
A METHOD FOR MAKING PRESTRESSED CONCRETE BEAMS COMPRISING POURING CONCRETE INTO A MOLD HAVING END WALL MEMBERS LOCATED IN SAID MOLD WITH REINFORCING RODS EXTENDING BETWEEN SAID END WALL MEMBERS, PLACING SAID END WALL MEMBERS AND REINFORCING RODS UNDER STRESS BY A STRESSING ELEMENT REMOVABLY ATTACHED TO SAID END WALL MEMBERS, INVERTING SAID MOLD PRIOR TO FINAL SETTING OF SAID CONCRETE AND REMOVING THE MOLD BUT NOT SAID END WALL MEMBERS FROM THE CONCRETE BEAM FORMED, THEN REMOVING SAID STRESSING ELEMENT FORM SAID END WALL MEMBERS AND ALLOWING THE CONCRETE TO FINALLY SET.
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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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |