US3387851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tandem stripper sealing apparatus
Assignee: Shaffer Tool Works
•
Filing: 1966-01-12
•
Granted: 1968-06-11
•
Expires: 1986-01-12
Abstract
No abstract record available.
Inventors
- 👤 Cugini Edward Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:01
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2313169A
Cited
US2731281A
Cited
US3052300A
Cited
US3260530A
Cited
US3216731A
Cited
US3268233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |