Patent US2859032A successfully refreshed from Google Patents.
Patent US3023475A successfully refreshed from Google Patents.
US3023475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing prestressed structural units
Assignee: Individual
•
Filing: 1957-04-02
•
Granted: 1962-03-06
•
Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Robert M Yerby
- 👤 Henry T Yerby
- 👤 Carlos F Yerby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:36
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE53548C
Cited
US1630839A
Cited
CA474524A
Cited
CA489515A
Cited
US910469A
Cited
US2408149A
Cited
US2590478A
Cited
GB743708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |