Patent US3823739A successfully refreshed from Google Patents.
US3823739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay
Assignee: ConocoPhillips Co
•
Filing: 1973-02-01
•
Granted: 1974-07-16
•
Expires: 1993-02-01
Abstract
Abstract A fail-safe lock-out device is disclosed which retains the piston portion of a pneumatic relay out of service until safety system pressure is returned to operating conditions at which time it releases the piston portion returning the relay to service.
Inventors
- 👤 Mullan J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:19
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K17/00; F16K17/02; F16K17/04; F16K17/042; F16K35/00; F16K35/06; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
211 words
A pneumatic relay which utilizes safety pressure and supply pressure, which comprises, in combination: a housing having a first and second end, orifice means for receiving safety system pressure at said second end, a piston portion extending from said first end, spring biasing means positioned between said housing and said piston portion to bias said piston portion toward said second end, orifice means for transmitting supply pressure through said housing between said first and second ends, bleeding means between said first and second ends communicating with said supply pressure orifice means and the exterior of said housing, a first casing attached to said housing having an opening therethrough perpendicularly aligned to said piston portion, a first elongated stem slidably positioned in said opening, spring biasing means positioned between sAid first casing and said first stem to bias said first stem away from said piston portion, a second casing attached to said housing having an opening therethrough perpendicularly aligned to said piston portion, a second elongated stem slidably positioned in said opening, spring biasing means positioned between said second casing and said second stem to bias said second stem toward said piston portion, and detent means formed in said piston portion of a dimension to mate with said first and second stems.
Claim 2
Dependent Claim
211 words
A pneumatic relay which utilizes safety pressure and supply pressure, which comprises, in combination: a housing having a first and second end, orifice means for receiving safety system pressure at said second end, a piston portion extending from said first end, spring biasing means positioned between said housing and said piston portion to bias said piston portion toward said second end, orifice means for transmitting supply pressure through said housing between said first and second ends, bleeding means between said first and second ends communicating with said supply pressure orifice means and the exterior of said housing, a first casing attached to said housing having an opening therethrough perpendicularly aligned to said piston portion, a first elongated stem slidably positioned in said opening, spring biasing means positioned between sAid first casing and said first stem to bias said first stem away from said piston portion, a second casing attached to said housing having an opening therethrough perpendicularly aligned to said piston portion, a second elongated stem slidably positioned in said opening, spring biasing means positioned between said second casing and said second stem to bias said second stem toward said piston portion, and detent means formed in said piston portion of a dimension to mate with said first and second stems.
Claim 3
Dependent Claim
18 words
The pneumatic relay of claim 1 wherein said first and second stems mate with the same detent means.
Claim 4
Dependent Claim
13 words
The pneumatic relay of claim 2 wherein said detent means is a groove.
Claim 5
Dependent Claim
18 words
The pneumatic relay of claim 1 wherein said supply pressure orifice means has an inlet and an outlet.
Claim 6
Dependent Claim
44 words
The pneumatic relay of claim 4 wherein said bleeding means is a port opened by the movement of said piston portion toward said second end by spring biasing means when safety system pressure decreases, simultaneously closing said inlet of said supply pressure orifice means.
References Cited (Backward Citations)
US481130A
Cited
US2759456A
Cited
US2844166A
Cited
US3044492A
Cited
US2927603A
Cited
US3145573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |