US3529840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing seal
Assignee: Caterpillar Inc
•
Filing: 1969-10-23
•
Granted: 1970-09-22
•
Expires: 1989-10-23
Abstract
No abstract record available.
Inventors
- 👤 Donald F Durham
- 👤 Bernard F Kupfert
- 👤 Donald D Necessary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:46
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C2352/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2202944A
Cited
US2341900A
Cited
US2712460A
Cited
US2797067A
Cited
GB891849A
Cited
AT232330B
Cited
US3269738A
Cited
US3313552A
Cited
US3370895A
Cited
US3480338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |