Patent US3211305A successfully refreshed from Google Patents.
US3211305A
Expired / Lapsed
US
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Caterpillar belt trains
Assignee: Individual
•
Filing: 1963-09-30
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Granted: 1965-10-12
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Davenport Everard
- 👤 Frank E Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:53
CPC Classifications
B; B61; B61D; B61D9/00; B61D9/14; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/30; B61D9/04; B61D9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN A CATERPILLAR BELT TRAIN, COMPRISING A PLURALITY OF UNIVERSALLY ARTICULATED, WHEELED UNDERCARRIAGE UNITS, A PLURALITY OF TROUGHED PANS CARRIED BY THE UNDERCARRIAGE UNITS AND TROUGHED FLEXIBLE MEMBRANES JOINING ADJACENT PANS, THE PANS AND THE MEMBRANES CONSTITUTING AN ELONGRATED LOAD-CARRYING SURFACES, THE IMPROVEMENT OF A PAIR OF PARALLEL UPSTANDING WALLS PROJECTING FROM THE EDGES OF THE PANS, HAVING RIGID PORTIONS OVER THE PANS AND FLEXIBLE PORTIONS OVERF THE REGIONS OF THE MEMBRANES AND EXTENDING THE
Claim 2
Dependent Claim
75 words
IN A CATERPILLAR BELT TRAIN, COMPRISING A PLURALITY OF UNIVERSALLY ARTICULATED, WHEELED UNDERCARRIAGE UNITS, A PLURALITY OF TROUGHED PANS CARRIED BY THE UNDERCARRIAGE UNITS AND TROUGHED FLEXIBLE MEMBRANES JOINING ADJACENT PANS, THE PANS AND THE MEMBRANES CONSTITUTING AN ELONGRATED LOAD-CARRYING SURFACES, THE IMPROVEMENT OF A PAIR OF PARALLEL UPSTANDING WALLS PROJECTING FROM THE EDGES OF THE PANS, HAVING RIGID PORTIONS OVER THE PANS AND FLEXIBLE PORTIONS OVERF THE REGIONS OF THE MEMBRANES AND EXTENDING THE
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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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |