Patent US3167308A successfully refreshed from Google Patents.
US3167308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Springs and strip steel
Assignee: Sandvik AB
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Filing: 1962-05-28
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Granted: 1965-01-26
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Expires: 1982-05-28
Abstract
No abstract record available.
Inventors
- 👤 Bernstein Axel Vilhelm
- 👤 Johansson Oscar Evald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:33
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/10; G; G04; G04B; G04B1/00; G04B1/10; G04B1/14; G04B1/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A SPIRAL METAL SPRING WHICH HAS CONTACTING SURFACES TENDING TO CONTACT EACH OTHER AND PRODUCE FRICTION, AND A TEFLON COATING STRIP OF LESSER WIDTH THAN THE SPRING AND POSITIONED SUBSTANTIALLY CONCENTRICALLY WITH RESPECT TO THE LONGITUDINAL CENTER LINE OF ONE OF SAID CONTACTING SURFACES AND PROVIDING AN ANTI-FRICTION SURFACE WHICH EXTENDS THROUGHOUT THE LONGITUDINAL EXTEND OF SAID CONTACTING SURFACE, SAID COATING STRIP HAVING A THICKNESS OF THE ORDER OF .00005 TO .00016 INCH.
Claim 2
Dependent Claim
73 words
A SPIRAL METAL SPRING WHICH HAS CONTACTING SURFACES TENDING TO CONTACT EACH OTHER AND PRODUCE FRICTION, AND A TEFLON COATING STRIP OF LESSER WIDTH THAN THE SPRING AND POSITIONED SUBSTANTIALLY CONCENTRICALLY WITH RESPECT TO THE LONGITUDINAL CENTER LINE OF ONE OF SAID CONTACTING SURFACES AND PROVIDING AN ANTI-FRICTION SURFACE WHICH EXTENDS THROUGHOUT THE LONGITUDINAL EXTEND OF SAID CONTACTING SURFACE, SAID COATING STRIP HAVING A THICKNESS OF THE ORDER OF .00005 TO .00016 INCH.
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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) | 1968-01-26 | 1968-07-27 | 1969-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-26 | 1972-07-27 | 1973-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-26 | 1976-07-27 | 1977-01-26 | $7700.00 | Window Closed / Lapsed |