US3459218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio relief valve
Assignee: Allied Healthcare Products Inc
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Filing: 1967-03-02
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Granted: 1969-08-05
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Expires: 1987-03-02
Abstract
No abstract record available.
Inventors
- 👤 Bidwell C Cranage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:07
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/44; F22B37/446; F16; F16K; F16K17/00; F16K17/02; F16K17/12; F16K37/00; Y; Y10; Y10S; Y10S261/00; Y10S261/65; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/8158; Y10T137/8326
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) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |