US3280397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Industrial truck
Assignee: Otis Elevator Co
•
Filing: 1964-03-25
•
Granted: 1966-10-18
•
Expires: 1984-03-25
Abstract
No abstract record available.
Inventors
- 👤 Bruns William Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:36
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02J; H02J7/00; H02J7/14; H02J7/1423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
AN INDUSTRIAL TRUCK, COMPRISING, DRIVE WHEELS, A HOISTING MECHANISM, A STORAGE BATTERY COMPRISING A PLURALITY OF CELLS CONNECTED IN SERIES, A FIRST DIRECT CURRENT DYNAMO ELECTRIC MACHINE HAVING AN ARMATURE OPERATING IN A SUBSTANTIALLY CONSTANT MAGNETIC FIELD AND OPERATIVELY CONNECTED TO SAID WHEELS, FIRST SWITCH MEANS FOR SELECTIVELY CONNECTING VARIOUS NUMBERS OF SAID CELLS TO SAID ARMATURE OF SAID FIRST MACHINE, SAID FIRST SWITCH MEANS INCLUDING A FIRST PRINCIPAL MOVABLE CONTACT AND FIRST AND SECOND AUXILIARY CONTACTS LEADING AND LAGGING, RESPECTIVELY, THE POSITION OF SAID FIRST PRINCIPAL CONTACT AND EACH CONNECTED THROUGH A DIODE TO SAID FIRST PRINCIPAL CONTACT,
Claim 2
Dependent Claim
99 words
AN INDUSTRIAL TRUCK, COMPRISING, DRIVE WHEELS, A HOISTING MECHANISM, A STORAGE BATTERY COMPRISING A PLURALITY OF CELLS CONNECTED IN SERIES, A FIRST DIRECT CURRENT DYNAMO ELECTRIC MACHINE HAVING AN ARMATURE OPERATING IN A SUBSTANTIALLY CONSTANT MAGNETIC FIELD AND OPERATIVELY CONNECTED TO SAID WHEELS, FIRST SWITCH MEANS FOR SELECTIVELY CONNECTING VARIOUS NUMBERS OF SAID CELLS TO SAID ARMATURE OF SAID FIRST MACHINE, SAID FIRST SWITCH MEANS INCLUDING A FIRST PRINCIPAL MOVABLE CONTACT AND FIRST AND SECOND AUXILIARY CONTACTS LEADING AND LAGGING, RESPECTIVELY, THE POSITION OF SAID FIRST PRINCIPAL CONTACT AND EACH CONNECTED THROUGH A DIODE TO SAID FIRST PRINCIPAL CONTACT,
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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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |