US1560763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packing head and blow-out preventer for rotary-type well-drilling apparatus
Assignee: Individual
•
Filing: 1925-01-27
•
Granted: 1925-11-10
•
Expires: 1945-01-27
Abstract
No abstract record available.
Inventors
- 👤 Frank M Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:49
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06
Claims Analysis
Total Claims: 0
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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) | 1928-11-09 | 1929-05-11 | 1929-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-11-09 | 1933-05-11 | 1933-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-11-09 | 1937-05-11 | 1937-11-10 | $7700.00 | Window Closed / Lapsed |