US2989281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operator for valves or the like
Assignee: 3M Co
•
Filing: 1957-02-25
•
Granted: 1961-06-20
•
Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Robert W Fritts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/1921; F; F03; F03G; F03G7/00; F03G7/06; F03G7/061; F03G7/0613; F25; F25B; F25B21/00; F25B21/02; F25B21/04; H; H10; H10N; H10N10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US327525A
Cited
US420641A
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US1844071A
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US1886439A
Cited
US2220028A
Cited
US2366881A
Cited
US2635431A
Cited
US2660030A
Cited
US2652503A
Cited
US2766937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |