US3495371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated concrete structure
Assignee: NEAL B MITCHELL JR
•
Filing: 1969-06-11
•
Granted: 1970-02-17
•
Expires: 1989-06-11
Abstract
No abstract record available.
Inventors
- 👤 Neal B Mitchell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:20
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/18; E04B1/20; E04B1/21; E04B1/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1321213A
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CA467791A
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US880243A
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US1060853A
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US1037416A
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GB605964A
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GB751847A
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US2943716A
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FR1283969A
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US3261135A
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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) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |