US2858958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1955-01-26
•
Granted: 1958-11-04
•
Expires: 1975-01-26
Abstract
No abstract record available.
Inventors
- 👤 Herbert J Hawthorne
- 👤 Earl M Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:50
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1239453A
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US1735056A
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US2257715A
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US2218188A
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US2621017A
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US2675939A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |