Patent US2839973A successfully refreshed from Google Patents.
US2839973A
Expired / Lapsed
US
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Concrete expansion joints
Assignee: Individual
•
Filing: 1955-01-03
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Granted: 1958-06-24
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Company Union Savings Trust
- 👤 Carl J Heltzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:04
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/12; E01C11/126; E01C11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1773918A
Cited
US1817914A
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US2082805A
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US2072381A
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US2051228A
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US2203078A
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US2050290A
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US2244315A
Cited
US2319049A
Cited
US2342181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |