Patent US3533512A successfully refreshed from Google Patents.
US3533512A
Expired / Lapsed
US
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Stacking desk trays
Assignee: COLE STEEL EQUIPMENT CO Inc
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Filing: 1968-01-02
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Granted: 1970-10-13
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Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur Serwer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:34
CPC Classifications
A; A47; A47B; A47B87/00; A47B87/02; A47B87/0207; A47B87/0261; A47B63/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |