US3385367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing device for perforated well casing
Assignee: Individual
•
Filing: 1966-12-07
•
Granted: 1968-05-28
•
Expires: 1986-12-07
Abstract
No abstract record available.
Inventors
- 👤 Kollsman Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/134; E21B33/12; E21B33/1208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US500558A
Cited
US672255A
Cited
US2094691A
Cited
US2452466A
Cited
US2945541A
Cited
US2849070A
Cited
US3067819A
Cited
US3134442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |