US3313552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Belleville spring and seal ring
Assignee: Hughes Tool Co
•
Filing: 1963-10-18
•
Granted: 1967-04-11
•
Expires: 1983-10-18
Abstract
No abstract record available.
Inventors
- 👤 Fred H Mcelya
- 👤 Albert P Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:41
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/16; B21D53/18; C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; C21D7/06; F; F16; F16F; F16F1/00; F16F1/02; F16F1/32; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/3456; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A BELLEVILLE SPRING ORIGINALLY BEING INVERTIBLE AND HAVING AN AXIS AND AT LEAST ONE ROUNDED CONICAL SECTION OF LARGE HEIGHT-TO-THICKNESS RATIO, SAID CONIC SECTION HAVING AN OUTER SURFACE FACING UPWARDLY AND OUTWARDLY FROM SAID AXIS AND AN INNER SURFACE FACING DOWNWARDLY AND INWARDLY TOWARD SAID AXIS, SAID SPRING BEING COLD WORKED ON
Claim 2
Dependent Claim
52 words
A BELLEVILLE SPRING ORIGINALLY BEING INVERTIBLE AND HAVING AN AXIS AND AT LEAST ONE ROUNDED CONICAL SECTION OF LARGE HEIGHT-TO-THICKNESS RATIO, SAID CONIC SECTION HAVING AN OUTER SURFACE FACING UPWARDLY AND OUTWARDLY FROM SAID AXIS AND AN INNER SURFACE FACING DOWNWARDLY AND INWARDLY TOWARD SAID AXIS, SAID SPRING BEING COLD WORKED ON
References Cited (Backward Citations)
US2234850A
Cited
US2341674A
Cited
US3075781A
Cited
US3002865A
Cited
US3114560A
Cited
US3073022A
Cited
US3137508A
Cited
US3029071A
Cited
US3096835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |