Patent US2750220A successfully refreshed from Google Patents.
US2750220A
Expired / Lapsed
US
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Seals
Assignee: Internat Seal & Knot Protector
•
Filing: 1953-06-19
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Granted: 1956-06-12
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Expires: 1973-06-19
Abstract
No abstract record available.
Inventors
- 👤 Keidel Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:53
CPC Classifications
G; G09; G09F; G09F3/00; G09F3/02; G09F3/03; G09F3/0305; G09F3/0347; G09F3/0352; G09F3/037; Y; Y10; Y10T; Y10T292/00; Y10T292/48; Y10T292/502; Y10T292/506
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |