US3821876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed hydraulic reservoir
Assignee: Individual
•
Filing: 1973-05-18
•
Granted: 1974-07-02
•
Expires: 1993-05-18
Abstract
Abstract A sealed hydraulic reservoir having a bellows seal against the surface of the fluid in the reservoir to permit the fluid to raise and fall in the reservoir without contact with outside air. A filter overlies the bellows to filter the air reaching the top of the bellows to prevent dirt from coming in contact with the bellows to damage the bellows. The filler cap for the reservoir is supported on posts extending upwardly from the bottom of the reservoir.
Inventors
- 👤 C Glaspell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:26
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A sealed hydraulic reservoir comprising a container having a generally horizontal bottom wall and side walls secured to said bottom wall and extending upwardly therefrom, a bellows secured to said side wall for contact with the top surface of hydraulic fluid in said container, a filler neck secured to said bellows, a pair of posts mounted on said bottom wall supporting said filler neck at the top of said container, and a generally horizontal filter extending across the top of said container for filtering the air engaging the upper side of said bellows.
Claim 2
Dependent Claim
93 words
A sealed hydraulic reservoir comprising a container having a generally horizontal bottom wall and side walls secured to said bottom wall and extending upwardly therefrom, a bellows secured to said side wall for contact with the top surface of hydraulic fluid in said container, a filler neck secured to said bellows, a pair of posts mounted on said bottom wall supporting said filler neck at the top of said container, and a generally horizontal filter extending across the top of said container for filtering the air engaging the upper side of said bellows.
Claim 3
Dependent Claim
21 words
A device as claimed in claim 1 wherein said bellows includes an upwardly extending central portion secured to said filler neck.
References Cited (Backward Citations)
US2378467A
Cited
US2841674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |