US3501882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight prestressed structural concrete member and method for manufacturing the same
Assignee: Individual
•
Filing: 1968-01-05
•
Granted: 1970-03-24
•
Expires: 1988-01-05
Abstract
No abstract record available.
Inventors
- 👤 Hideya Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:37
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/22; E04C2/00; E04C2/02; E04C2/04; E04C2/041; E04C2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US517576A
Cited
US1028578A
Cited
US1214442A
Cited
GB116346A
Cited
CH212826A
Cited
GB618431A
Cited
DE835798C
Cited
GB709678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |