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Patent US2980216A successfully refreshed from Google Patents.
US2980216A
Expired / Lapsed
US
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Constructional metalwork
Assignee: FORMWORK PATENTS Ltd
•
Filing: 1958-03-03
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Granted: 1961-04-18
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Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Richards Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/02; E04G1/12; Y; Y10; Y10T; Y10T403/00; Y10T403/34; Y10T403/341
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US384196A
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US1387542A
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US1846567A
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US1738854A
Cited
GB375009A
Cited
US2007898A
Cited
US1942391A
Cited
US2376023A
Cited
GB574311A
Cited
US2559741A
Cited
US2687102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |