Patent US3711917A successfully refreshed from Google Patents.
US3711917A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated spring
Assignee: Boeing North American Inc
•
Filing: 1969-08-18
•
Granted: 1973-01-23
•
Expires: 1989-08-18
Abstract
Abstract This disclosure relates to springs that are encased in a coating of protective-material, this protective-material being of the heat-shrinkable type; so that the disclosed arrangement permit simultaneous heat-treating of the spring-material and heatshrinking of the protective material.
Inventors
- 👤 G Baumgras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
B; B21; B21F; B21F99/00; B21F3/00; B21F35/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T29/49908
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
The process of making an encased formed-spring comprising the steps of: encasing a length of spring-material in a corresponding length of expanded heat-shrinkable protective material having a substantially-uniform wall-thickness; forming said combination of spring-material and encasing protecting material into a desired spring-configuration; and heating said combination of spring-material and encasing protective material to a temperature (a) that spring-tempers said formed spring material, and (b) shrinks said expanded heat-shrinkable protective material to form-around said formed spring-material-a snug glove having a substantially uniform thickness.
Claim 2
Dependent Claim
94 words
The process of making an encased formed-spring comprising the steps of: encasing a length of spring-wire of the 17-7 PHO86 in a corresponding tubular length of expanded heat-shrinkable protective-material having a substantially uniform wall-thickness; fOrming said combination of spring-wire and encasing protecting material into a desired spring configuration; and heating said combination of formed spring-wire and encasing protective material to a temperature suitable to (a) relieve the stress of said formed spring-material, and (b) shrink said expanded heat-shrinkable protective material to form a snug glove having a substantially uniform wall-thickness around said formed spring-material.
Claim 3
Dependent Claim
12 words
The combination of claim 3 wherein said material is of the tetrafluoroethylene-type.
References Cited (Backward Citations)
US2058165A
Cited
US2344858A
Cited
US2893789A
Cited
US2951109A
Cited
US3449199A
Cited
US3196194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |