US2994254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic sidewalk
Assignee: Individual
•
Filing: 1957-03-01
•
Granted: 1961-08-01
•
Expires: 1977-03-01
Abstract
No abstract record available.
Inventors
- 👤 John F Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
E; E01; E01C; E01C15/00; E01C11/00; E01C11/24; E01C11/26; E01C11/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US223784A
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US351647A
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US436821A
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US643677A
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US993244A
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US1138983A
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GB229551A
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GB375234A
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US2013377A
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US2225496A
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US2478993A
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US2635513A
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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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |