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US2586015A
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US
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Assignee: Individual
•
Filing: 1945-04-27
•
Granted: 1952-02-19
•
Expires: 1965-04-27
Abstract
No abstract record available.
Inventors
- 👤 Edwards Frances Robertha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:43
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1648377A
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US1607481A
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US1684551A
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US2214550A
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US1883071A
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US2122751A
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US2128352A
Cited
US2118350A
Cited
US2210815A
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US2244124A
Cited
US2394759A
Cited
US2462477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |