US2618155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pit-level indicator
Assignee: Individual
•
Filing: 1945-11-02
•
Granted: 1952-11-18
•
Expires: 1965-11-02
Abstract
No abstract record available.
Inventors
- 👤 Ray E Conner
- 👤 Joseph W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/7287; Y10T137/7358; Y10T137/7423
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1676848A
Cited
US2006531A
Cited
US2022582A
Cited
DE633274C
Cited
US2248322A
Cited
US2342696A
Cited
US2307229A
Cited
US2369571A
Cited
US2381948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |