Patent US3230907A successfully refreshed from Google Patents.
US3230907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable bleacher unit
Assignee: Iowa State University Research Foundation Inc
•
Filing: 1962-08-22
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Granted: 1966-01-25
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Expires: 1982-08-22
Abstract
No abstract record available.
Inventors
- 👤 Vilas J Morford
- 👤 Eggenberger Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/12; E04H3/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2663914A
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US2817121A
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US2760216A
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US2876503A
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US3001243A
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US2968843A
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US2978754A
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US3103707A
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |