Patent US3481093A successfully refreshed from Google Patents.
US3481093A
Expired / Lapsed
US
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Building structure comprising collapsible building units filled in situ with concrete
Assignee: COLIN H DAVIDSON
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Filing: 1967-10-18
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Granted: 1969-12-02
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Expires: 1987-10-18
Abstract
No abstract record available.
Inventors
- 👤 Colin H Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:17
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/84; E04B2/86; E04B2/8635
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1578511A
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US1815492A
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US2143288A
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US3112532A
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US3186131A
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US3255562A
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US3344572A
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US3363372A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |