Patent US2970602A successfully refreshed from Google Patents.
US2970602A
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Positive pressure demand regulator
Assignee: Avox Systems Inc
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Filing: 1956-04-23
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Granted: 1961-02-07
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Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 Cupp Charles David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/04; Y; Y10; Y10S; Y10S137/00; Y10S137/908; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7822; Y10T137/7823; Y10T137/7826; Y10T137/7827
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US627390A
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US2406888A
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US2604315A
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US2639881A
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US2597961A
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US2790454A
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US2760507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |