Patent US3520508A successfully refreshed from Google Patents.
US3520508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete formwork
Assignee: Acrow Engineers Ltd
•
Filing: 1967-08-07
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Granted: 1970-07-14
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Expires: 1987-08-07
Abstract
No abstract record available.
Inventors
- 👤 John Barrington Sewell
- 👤 Jack Raymond Tooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:00
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/36; E04G11/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |