US3180634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid spring
Assignee: Precision Products Inc
•
Filing: 1961-11-01
•
Granted: 1965-04-27
•
Expires: 1981-11-01
Abstract
No abstract record available.
Inventors
- 👤 Elmer F Heiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:52
CPC Classifications
B; B21; B21D; B21D24/00; B21D24/02; B30; B30B; B30B15/00; B30B15/02; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A DEVICE FOR USE WITH RELATIVELY MOVABLE FIRST AND SECOND MEMBER, A CYLINDER ADAPTED TO BE FIXED IN SAID FIRST MEMBER, A PISTON HEAD MOVABLE IN SAID CYLINDER AND BIASED IN A FIRST DIRECTION BY A BIASING FORCE IN SAID CYLINDER, A PISTON ROD HAVING ONE END IN ABUTTING ENGAGEMENT WITH SAID PISTON ROD HEAD, AND ENGAGEMENT CONSISTING OF COOPERATING CONCAVE AND CONVEX SURFACES ON THE PISTON HEAD AND PISTON ROD, AND END CAP SLIDABLY MOUNTED ON THE OTHER END OF SAID PISTON ROD OPPOSITE SAID ONE END TO ENGAGE SAID SECOND MEMBER, AND SPRING MEANS POSITIONED BETWEEN SAID END CAP AND SAID SECOND END OF SAID PISTON ROD TO URGE SAID CONCAVE AND CONVEX SURFACES INTO INTIMATE CONTACT WHEN SAID END CAP IS IN ENGAGEMENT WITH SAID SECOND MEMBER.
Claim 2
Dependent Claim
131 words
IN A DEVICE FOR USE WITH RELATIVELY MOVABLE FIRST AND SECOND MEMBER, A CYLINDER ADAPTED TO BE FIXED IN SAID FIRST MEMBER, A PISTON HEAD MOVABLE IN SAID CYLINDER AND BIASED IN A FIRST DIRECTION BY A BIASING FORCE IN SAID CYLINDER, A PISTON ROD HAVING ONE END IN ABUTTING ENGAGEMENT WITH SAID PISTON ROD HEAD, AND ENGAGEMENT CONSISTING OF COOPERATING CONCAVE AND CONVEX SURFACES ON THE PISTON HEAD AND PISTON ROD, AND END CAP SLIDABLY MOUNTED ON THE OTHER END OF SAID PISTON ROD OPPOSITE SAID ONE END TO ENGAGE SAID SECOND MEMBER, AND SPRING MEANS POSITIONED BETWEEN SAID END CAP AND SAID SECOND END OF SAID PISTON ROD TO URGE SAID CONCAVE AND CONVEX SURFACES INTO INTIMATE CONTACT WHEN SAID END CAP IS IN ENGAGEMENT WITH SAID SECOND MEMBER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |