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US2580744A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1949-06-11
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Granted: 1952-01-01
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Expires: 1969-06-11
Abstract
No abstract record available.
Inventors
- 👤 Harrison G Edsall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:45
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/16; G02C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE358996C
Cited
US1544925A
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US1911842A
Cited
US2052772A
Cited
US2055386A
Cited
US2093536A
Cited
US2247971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |