Patent US3534518A successfully refreshed from Google Patents.
US3534518A
Expired / Lapsed
US
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Interlocking building block construction
Assignee: STARK CERAMICS Inc A CORP OF OHIO
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Filing: 1968-09-27
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Granted: 1970-10-20
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Expires: 1988-09-27
Abstract
No abstract record available.
Inventors
- 👤 Harold F Zagray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:30
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/06; F27B9/061; E; E04; E04B; E04B2/00; E04B2/02; E04B2/42; E04B2/44; E04B2/46; E04B2/52; F27B9/062; F27B9/063; F27B9/14; F27B9/147; F27B9/20; F27B9/26; F27D; F27D3/00; F27D3/12; E04B2002/0202; E04B2002/0204; E04B2002/0208; F27D2003/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1581574A
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GB204263A
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Cited
US2749739A
Cited
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US2994162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |