US3401438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing pretensioned concrete slabs
Assignee: Houdaille Industries Inc
•
Filing: 1963-09-30
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Granted: 1968-09-17
•
Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Howard L Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:13
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/08; B28B1/084; B28B23/00; B28B23/02; B28B23/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
AN APPARATUS FOR MANUFACTURING CONCRETE SLABS HAVING SPACED PRE-TENSIONED REINFORCING STRANDS EXTENDING THEREALONG, COMPRISING A FRAME MOUNTED FOR MOVEMENT ALONG THE GROUND, A BIN MOUNTED ON SAID FRAME FOR DISCHARGING A LAYER OF CONCRETE OVER PREVIOUSLY PRE-TENSIONED REINFORCING STRANDS, AND A VIBRATOR MOUNTED ON SAID FRAME IN ADVANCE OF SAID BIN AND HAVING MEANS ASSOCIATED THEREWITH HAVING VIBRATORY ENGAGEMENT WITH THE PRE-TENSIONED STRANDS.
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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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |