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US2557552A
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US
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Assignee: Individual
•
Filing: 1948-10-11
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Granted: 1951-06-19
•
Expires: 1968-10-11
Abstract
No abstract record available.
Inventors
- 👤 Eileen T Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:00
CPC Classifications
A; A42; A42B; A42B1/00; A42B1/24; A42B1/247; G; G02; G02C; G02C3/00; G02C3/02; Y; Y10; Y10S; Y10S2/00; Y10S2/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US947636A
Cited
GB191211159A
Cited
US1182210A
Cited
US1749340A
Cited
US2116076A
Cited
US2431568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |