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US2980400A
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Hook-block assembly
Assignee: Armco Inc
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Filing: 1957-02-05
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Granted: 1961-04-18
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Expires: 1977-02-05
Abstract
No abstract record available.
Inventors
- 👤 Spencer W Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:13
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/04; B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1713586A
Cited
US2331341A
Cited
US2681794A
Cited
US2613101A
Cited
US2778602A
Cited
US2820624A
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 |