US3562989A
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 THE BLOCKS ARE SQUARE IN FACE AREA, AND HAVE CENTRALLY EXTENDING DOVETAIL GROOVES IN BOTH RECTANGULAR DIRECTIONS ACROSS THEIR INTERLOCKING FACES, LEAVING HALF RIDGE PORTIONS ONLY AT THE CORNERS OF THESE FACES OF THE BLOCKS IN ONE LAYER OF A WALL FOR INTERLOCKING WITH THE SINGLE GROOVES OF THE BLOCKS IN THE OTHER LAYER, WHICH ARE ARRANGED SO THAT ALTERNATE BLOCKS IN SAID OTHER LAYER HAVE THEIR GROOVES IN ALTERNATE HORIZONTALLY AND VERTICALLY SLIDABLE ENGAGEMENT WITH SAID CORNER RIDGE PORTIONS OF SAID CROSS-GROOVED BLOCKS, PROVIDING A COMPLETE INTERLOCK AGAINST SLIDING BETWEEN LAYERS IN EITHER RECTANGULAR DIRECTION.
Inventors
- 👤 Resta S Gregoire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/04; E04B2/06; E04B2/08; E04B1/00; E04B1/62; E04B1/66; E04B1/68; E04B2/28; E04B2/30; E04B2/32; E04B7/00; E04B7/08; E04B7/10; E04B7/107; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/16; E04B2002/0202; E04B2002/0232; E04B2002/0234; E04B2002/0297
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 |