US3283457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete plank construction
Assignee: BALTIMORE CONCRETE PLANK CORP
•
Filing: 1964-01-22
•
Granted: 1966-11-08
•
Expires: 1984-01-22
Abstract
No abstract record available.
Inventors
- 👤 Wayne C Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:43
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
A PRE-STRESSED CONCRETE PLANK COMPRISING IN COMBINATION IN THE ABSENCE OF EXTERNAL LOAD: A PLURALITY OF CONCRETE BLOCKS ALIGNED IN END TO END ABUTTING RELATIONSHIP UNDER LONGITUDINAL COMPRESSION HAVING A LONGITUDIALLY EXTENDING TRANSVERSELY CENTERED PASSAGE THERETHROUGH AND AT LEAST ONE LONGITUDINALLY EXTENDING LATERAL PASSAGE THERETHROUGH TRANSVERSELY SPACED FROM SAID TRANSVERSELY CENTERED PASSAGE; A TENSIONED CABLE MEANS WITHIN SAID TRANSVERSELY CENTERED PASSAGE; A SUBSTANTIALLY UNTENSIONED ROD MEANS WITHIN EACH SAID LATERAL PASSAGE; AND STRESS TRANSMITTING BONDING MEANS WITHIN EACH OF SAID LONGITUDINALLY EXTENDING PASSAGES BONDING SAID SUBSTANTIALLY UNTENSIONED ROD MEANS AND SAID TENSIONED CABLE MEANS TO SAID BLOCKS.
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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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |