Patent US2938633A successfully refreshed from Google Patents.
US2938633A
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US
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Assignee: Individual
•
Filing: 1957-07-29
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Granted: 1960-05-31
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 David J Schmidt
- 👤 Herbert M Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:29
CPC Classifications
A; A47; A47B; A47B47/00; A47B47/04; A47B47/042; A47B47/0075; A47B2230/00; A47B2230/16
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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |