US3537518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety drill pipe float valve with heat responsive shut off sleeve
Assignee: Jackson Memorial Hospital
•
Filing: 1969-04-22
•
Granted: 1970-11-03
•
Expires: 1989-04-22
Abstract
No abstract record available.
Inventors
- 👤 Wayne M Sullivan
- 👤 John W Turner Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:49
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B35/00; F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K2200/00; F16K2200/30; F16K2200/303; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/7904; Y10T137/7922; Y10T137/7923; Y10T137/7929; Y10T137/7935; Y10T137/7939
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
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 |