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US2446620A
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Automatic pressure sealing device
Assignee: Bakelite Corp
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Filing: 1944-01-28
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Granted: 1948-08-10
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Expires: 1964-01-28
Abstract
No abstract record available.
Inventors
- 👤 Herbert A Swallow
- 👤 Vilbiss Thomas A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:05
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/91; B29C48/03; B29C48/06; B29C48/254; B29C48/001; B29C48/0018; B29C48/05; B29C48/09; B29C48/10; B29C48/15; B29C48/154; B29L; B29L2031/00; B29L2031/06; Y; Y10; Y10S; Y10S277/00; Y10S277/906; Y10S277/927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1477879A
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US1689206A
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US2029435A
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US2193587A
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US2193887A
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US2227814A
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US2307575A
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US2291344A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |