US3019840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1958-06-25
•
Granted: 1962-02-06
•
Expires: 1978-06-25
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Kennard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:29
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/16; E21B29/00; E21B31/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2149417A
Cited
US2481637A
Cited
US2629445A
Cited
US2804151A
Cited
US2762438A
Cited
US2859943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |