US2987111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible backrest for retractable bleachers
Assignee: Consolidated Foundries and Manufacturing Corp
•
Filing: 1959-01-20
•
Granted: 1961-06-06
•
Expires: 1979-01-20
Abstract
No abstract record available.
Inventors
- 👤 Robert S Walworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:05
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/12; E04H3/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1542770A
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FR660989A
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GB328563A
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US1974223A
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GB436162A
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US2183056A
Cited
US2445362A
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GB622794A
Cited
US2744566A
Cited
US2817389A
Cited
US2817122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |