US3298146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilevel subsurface building construction
Assignee: Individual
•
Filing: 1964-10-26
•
Granted: 1967-01-17
•
Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Retz Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:22
CPC Classifications
E; E04; E04H; E04H9/00; E04H9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2705928A
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US2912940A
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US2971227A
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US2978755A
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US3118148A
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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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |