US2750052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding shelf arrangements for book stacks
Assignee: Hamilton Manufacturing Co
•
Filing: 1952-12-06
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Granted: 1956-06-12
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Expires: 1972-12-06
Abstract
No abstract record available.
Inventors
- 👤 Clifford S Brown
- 👤 Charles S O'neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:03
CPC Classifications
A; A47; A47B; A47B46/00; A47B57/00; A47B57/30; A47B57/48; A47B57/50; A47B88/00; A47B88/40; A47B88/483; A47B88/487; A47B88/50; A47B2210/00; A47B2210/0002; A47B2210/0029; A47B2210/0037; A47B2210/0043; A47B2210/0051; A47B2210/0059; A47B63/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US883069A
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US1019983A
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US1748843A
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US1906832A
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US1975327A
Cited
US2098198A
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US2217890A
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US2494221A
Cited
CH259081A
Cited
US2644588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |