Patent US3537748A successfully refreshed from Google Patents.
US3537748A
Expired / Lapsed
US
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Combined ambulatory assistance device and folding chair
Assignee: ORVILLE L KNAPP
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Filing: 1969-03-03
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Granted: 1970-11-03
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Expires: 1989-03-03
Abstract
No abstract record available.
Inventors
- 👤 Orville L Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:15
CPC Classifications
A; A61; A61H; A61H3/00; A47; A47C; A47C13/00; A47C4/00; A47C4/04; A47C4/18; A47C4/20; A61G; A61G5/00; A61G5/08; A61G5/0808; A61G5/0833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |