US3499293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming underground construction in situ
Assignee: Taisei Corp
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Filing: 1968-11-20
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Granted: 1970-03-10
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Expires: 1988-11-20
Abstract
No abstract record available.
Inventors
- 👤 Seiji Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/18; E02D5/182; E02D5/22; E02D5/34; E02D5/38; E02D5/385; E02F; E02F5/00; E02F5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |