Patent US2999729A successfully refreshed from Google Patents.
US2999729A
Expired / Lapsed
US
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Adjustable support for a platform
Assignee: Virco Manufacturing Corp
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Filing: 1959-03-09
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Granted: 1961-09-12
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Expires: 1979-03-09
Abstract
No abstract record available.
Inventors
- 👤 Albert N Semmelroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:19
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/28; E04G1/32; A; A47; A47B; A47B9/00; A47B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US572731A
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US900061A
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US881312A
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US992011A
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US1091615A
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US1243750A
Cited
US2875007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |