US3315429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall construction and element
Assignee: National Steel Corp
•
Filing: 1964-07-07
•
Granted: 1967-04-25
•
Expires: 1984-07-07
Abstract
No abstract record available.
Inventors
- 👤 William D Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:02
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/07; E04F13/08; E04F13/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US220181A
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US416851A
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US1121594A
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US1763870A
Cited
GB472199A
Cited
US2157359A
Cited
US2511074A
Cited
US2477987A
Cited
US2876871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |