US2930347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum seal for evacuated systems
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1956-04-13
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Granted: 1960-03-29
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Jack J Bulloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:24
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/4401; C23C16/4409; C23C14/00; C23C14/22; C23C14/56; C23C14/562; C23C16/54; Y; Y10; Y10S; Y10S277/00; Y10S277/906
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |