Patent US2737801A successfully refreshed from Google Patents.
US2737801A
Expired / Lapsed
US
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Hollow structural clay building unit
Assignee: Individual
•
Filing: 1949-08-09
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Granted: 1956-03-13
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Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Vern A Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:07
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2002/0256; E04B2002/026; Y; Y10; Y10S; Y10S425/00; Y10S425/109
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2209643A
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US2508901A
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US2506244A
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GB614059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |