US3528209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete beams with wooden inserts and method of forming the same
Assignee: Individual
•
Filing: 1967-10-20
•
Granted: 1970-09-15
•
Expires: 1987-10-20
Abstract
No abstract record available.
Inventors
- 👤 Jack Schillinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:12
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/26; B; B28; B28B; B28B23/00; B28B23/02; B28B23/022; B28B23/024
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US728857A
Cited
US899112A
Cited
US967274A
Cited
US1064056A
Cited
US1559749A
Cited
US1649909A
Cited
DE856205C
Cited
DE848564C
Cited
FR1461536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |