Patent US3538521A successfully refreshed from Google Patents.
US3538521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hospital mattress
Assignee: Sealy Inc
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Filing: 1968-07-15
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Granted: 1970-11-10
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Expires: 1988-07-15
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Basner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:02
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/04; A47C27/045; A47C27/0456; A47C27/001; A47C27/05; A47C27/14; A47C27/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |