Patent US3562988A successfully refreshed from Google Patents.
US3562988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building blocks, bricks, tile, panels and the like
Assignee: LOCK BLOCK CO Z
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Filing: 1969-06-24
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Granted: 1971-02-16
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Expires: 1989-06-24
Abstract
Abstract BEAMS HAVE BLOCK INTERLOCK FACES ON THEIR ENDS FOR INTERLOCKING SUPPORT IN A CORRESPONDING WALL, AND HAVE A COUNTER GROOVE IN THEIR UPPER SURFACES FOR RECEIVING A HORIZONTAL LEDGE PORTION OF LEDGE BLOCKS WHICH ARE AT A CORRESPONDING LEVEL IN THE OPPOSITE LAYER OF SAID WALL.
Inventors
- 👤 Resta S Gregoire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/28; E04B2/30; E04B2/32; E04B2/04; E04B2/06; E04B2/08; E04B2/12; E04B2002/0202; E04B2002/0232; E04B2002/0234
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |