Patent US2705535A successfully refreshed from Google Patents.
US2705535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well heating method and apparatus
Assignee: Individual
•
Filing: 1950-06-24
•
Granted: 1955-04-05
•
Expires: 1970-06-24
Abstract
No abstract record available.
Inventors
- 👤 Russell R Waterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:35
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US48994A
Cited
US200393A
Cited
US403183A
Cited
US760304A
Cited
US1012777A
Cited
US1709581A
Cited
US1714647A
Cited
US1960999A
Cited
US2049050A
Cited
US2035381A
Cited
US2094038A
Cited
US2208784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |