US2539375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio-frequency bar sealer and control apparatus therefor
Assignee: Singer Co
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Filing: 1947-11-21
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Granted: 1951-01-23
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Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth B Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:24
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/84; B29C66/845; B29C65/00; B29C65/02; B29C65/04; B29C66/81; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/8226; B29C66/82263; B29C66/83; B29C66/832; B29C66/8322
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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |