US2691293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced concrete slab
Assignee: PATTERSON SHEPARD Inc
•
Filing: 1949-04-05
•
Granted: 1954-10-12
•
Expires: 1969-04-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:37
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/02; E04F21/04; Y; Y10; Y10S; Y10S411/00; Y10S411/918; Y10T; Y10T24/00; Y10T24/34; Y10T24/3427; Y10T24/3439; Y10T24/344
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US667384A
Cited
US1398852A
Cited
US1505220A
Cited
US1668858A
Cited
US1666613A
Cited
US1741585A
Cited
US1748017A
Cited
US1818404A
Cited
US2027516A
Cited
US1874591A
Cited
US1900686A
Cited
US2123425A
Cited
US2262704A
Cited
US2240427A
Cited
US2379179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |