US3497215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exercise escalator
Assignee: Johns Hopkins University
•
Filing: 1967-04-03
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Granted: 1970-02-24
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Walter K Harrison
- 👤 Samuel A Talbot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:40
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/15; A63B21/151; A63B21/154; A63B22/00; A63B22/04; A63B21/008; A63B2220/00; A63B2220/30; A63B2220/34
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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |