US3440730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugally controlled signalling drift apparatus
Assignee: Jackson Memorial Hospital
•
Filing: 1966-09-28
•
Granted: 1969-04-29
•
Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 Robert L Alder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:00
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/024; E21B21/00; E21B21/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |