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US2981959A
Expired / Lapsed
US
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Supporting device for invalids
Assignee: Individual
•
Filing: 1957-06-27
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Granted: 1961-05-02
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Expires: 1977-06-27
Abstract
No abstract record available.
Inventors
- 👤 Inez U Burnham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:10
CPC Classifications
A; A61; A61G; A61G7/00; A61G7/05; A61G7/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320286A
Cited
US575711A
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GB190905726A
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CH64579A
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CH122878A
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GB367023A
Cited
US2079617A
Cited
US2710975A
Cited
US2757388A
Cited
US2788055A
Cited
US2707962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |