Patent US3468094A successfully refreshed from Google Patents.
US3468094A
Expired / Lapsed
US
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Building erection system
Assignee: Campbell Research Corp
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Filing: 1968-02-05
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Granted: 1969-09-23
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Expires: 1988-02-05
Abstract
No abstract record available.
Inventors
- 👤 Henry Fred Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/35; E04B2001/3566
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1784568A
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US2298184A
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US2428374A
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US3230679A
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US3242549A
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US3231646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |