US3780693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visible fluid pressure indicator
Assignee: Individual
•
Filing: 1972-05-15
•
Granted: 1973-12-25
•
Expires: 1992-05-15
Abstract
Abstract An indicator including a casing having a coupling connected with a source of fluid and a cap for the coupling, the cap having a window. The indicator also includes a closed, expansible and contractible container that is disposed within the cap, part of the container being visible through the window.
Inventors
- 👤 E Parr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A visible fluid pressure indicator comprising in combination: A. a casing including: 1. a coupling formed of light-impervious material adapted to be attached to a source of fluid, said coupling having a passage in open communication with the source of fluid, 2. an elongated cap having the lower end attached to the coupling and having a vertically elongated window adjacent the other end thereof; B. a closed, expansible and contractible container in open communication with the passage in the coupling, the upper portion only of the container being disposed to be visible through the window in the cap.
Claim 2
Dependent Claim
98 words
A visible fluid pressure indicator comprising in combination: A. a casing including: 1. a coupling formed of light-impervious material adapted to be attached to a source of fluid, said coupling having a passage in open communication with the source of fluid, 2. an elongated cap having the lower end attached to the coupling and having a vertically elongated window adjacent the other end thereof; B. a closed, expansible and contractible container in open communication with the passage in the coupling, the upper portion only of the container being disposed to be visible through the window in the cap.
Claim 3
Dependent Claim
29 words
A visible fluid pressure indicator as defined in claim 1, characterized in that the container includes a flange, said coupling and cap being in sealing relationship with the flange.
Claim 4
Dependent Claim
56 words
an elongated cap having the lower end attached to the coupling and having a vertically elongated window adjacent the other end thereof; B. a closed, expansible and contractible container in open communication with the passage in the coupling, the upper portion only of the container being disposed to be visible through the window in the cap.
Claim 5
Dependent Claim
56 words
an elongated cap having the lower end attached to the coupling and having a vertically elongated window adjacent the other end thereof; B. a closed, expansible and contractible container in open communication with the passage in the coupling, the upper portion only of the container being disposed to be visible through the window in the cap.
Claim 6
Dependent Claim
47 words
A visible fluid pressure indicator as defined in claim 2, characterized in that the container includes a lower bellows portion and an indicating portion forming a closed and solid upper end of the container and having a diameter that is smaller than the diameter of the bellows.
Claim 7
Dependent Claim
31 words
A visible fluid pressure indicator as defined in claim 3, characterized in that the portion of the cap having the window is of smaller diameter than the portion surrounding the bellows.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |