Patent US2476972A successfully refreshed from Google Patents.
US2531797A
Expired / Lapsed
US
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Extensible metallic structure
Assignee: WELLWARD TOOL Co Inc
•
Filing: 1948-03-03
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Granted: 1950-11-28
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Expires: 1968-03-03
Abstract
No abstract record available.
Inventors
- 👤 Rudyard K Wellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:00
CPC Classifications
E; E04; E04F; E04F10/00; E04F10/08; E04F10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US162361A
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US427287A
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US1636200A
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US888433A
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US1555645A
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US1648851A
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US1832966A
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US2078134A
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US2263540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |