Patent US3437098A successfully refreshed from Google Patents.
US3437098A
Expired / Lapsed
US
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System of automatic controls for gas mixing
Assignee: North American Utility Construction Corp
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Filing: 1965-10-25
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Granted: 1969-04-08
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Expires: 1985-10-25
Abstract
No abstract record available.
Inventors
- 👤 Virgil Stark
- 👤 Jacques Sliosberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:32
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/2026; G05D16/204; G05D11/00; G05D11/02; G05D11/13; G05D11/131; G05D11/132; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0379; Y10T137/6416; Y10T137/7722; Y10T137/7758; Y10T137/7761; Y10T137/8158; Y10T137/8175; Y10T137/8192; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/87571; Y10T137/87676; Y10T137/87684; Y10T137/87692
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) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |