Patent US2993571A successfully refreshed from Google Patents.
US2993571A
Expired / Lapsed
US
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Roof anchor
Assignee: Individual
•
Filing: 1957-07-01
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Granted: 1961-07-25
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Elgrin C Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:38
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/36; E04D3/3607
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US777058A
Cited
US894489A
Cited
DE728680C
Cited
US2424410A
Cited
US2577582A
Cited
US2672107A
Cited
US2748727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |