US2813310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite floor or roof support
Assignee: DEX (PREFABRICATIONS) Ltd
•
Filing: 1953-07-29
•
Granted: 1957-11-19
•
Expires: 1973-07-29
Abstract
No abstract record available.
Inventors
- 👤 Harrison Donald Dex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:23
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/02; E04B5/14; E04B5/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US8624A
Cited
US375999A
Cited
US1412096A
Cited
US1356315A
Cited
GB354959A
Cited
US2183015A
Cited
US2249106A
Cited
GB605964A
Cited
GB646565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |