US3422841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety cut-off valves for gas supply systems
Assignee: Bryan Donkin Co Ltd
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Filing: 1967-07-10
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Granted: 1969-01-21
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Sydney Farrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:33
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/247; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/10; F16K31/105; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7728; Y10T137/773; Y10T137/7781; Y10T137/7793; Y10T137/7822; Y10T137/783
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |