Patent US2688931A successfully refreshed from Google Patents.
US2688931A
Expired / Lapsed
US
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Current supply and control means for traveling conveyers
Assignee: Mechanical Handling Systems Inc
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Filing: 1950-01-17
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Granted: 1954-09-14
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Expires: 1970-01-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Spafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:49
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/002; B61L23/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1297680A
Cited
US1381317A
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US1379614A
Cited
US1487315A
Cited
US2201013A
Cited
US2486221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |