Patent US3628004A successfully refreshed from Google Patents.
US2668435A
Expired / Lapsed
US
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Hollow structural building unit
Assignee: Individual
•
Filing: 1948-11-12
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Granted: 1954-02-09
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Expires: 1968-11-12
Abstract
No abstract record available.
Inventors
- 👤 Clements Norman Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:15
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/42; E04B2/44; E04B2/46; E04B2002/0202; E04B2002/0204; E04B2002/021; E04B2002/0215; E04B2002/0223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US599864A
Cited
US831732A
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AT93507B
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US1630698A
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US1751272A
Cited
US2019653A
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US2192691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |