US2991787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracheotomy instrument
Assignee: Sierra Engineering Co
•
Filing: 1957-04-11
•
Granted: 1961-07-11
•
Expires: 1977-04-11
Abstract
No abstract record available.
Inventors
- 👤 Shelden C Hunter
- 👤 Walter H Goodwin
- 👤 Bob A Kindred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:25
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/04; A61M16/0465; A61M16/0472; A61M16/0402; A61M16/0427; A61M16/0429
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
AT146305B
Cited
US2786469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |