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Patent US2086957A successfully refreshed from Google Patents.
US2086957A
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US
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Vacuum control apparatus
Assignee: Wallace & Tiernan Co Inc
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Filing: 1934-10-31
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Granted: 1937-07-13
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Expires: 1954-10-31
Abstract
No abstract record available.
Inventors
- 👤 Gerald D Peet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:24
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/763; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2572; Y10T137/8158; Y10T137/8225; Y10T137/8593; Y10T137/86381
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-07-12 | 1941-01-11 | 1941-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-07-12 | 1945-01-11 | 1945-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-07-12 | 1949-01-11 | 1949-07-13 | $7700.00 | Window Closed / Lapsed |