US3147001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door-operators
Assignee: Individual
•
Filing: 1957-07-01
•
Granted: 1964-09-01
•
Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Purdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:22
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/70; E05F15/77; E05F15/78; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05F15/681; E05F15/686; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A DOOR OPERATOR, A DOOR, A TRACK FOR GUIDING SAID DOOR BETWEEN CLOSED AND OPEN POSITIONS, A MOTOR AND SHAFT, A DRIVE-WHEEL ON THE SHAFT AND A PULLEY SPACED FROM SAID DRIVE-WHEEL IN THE DIRECTION OF MOVEMENT OF SAID DOOR FOR CONFINING A CABLE WITHIN A DOOR-DRIVING RANGE, A CABLE IN ENDLESS BELT ARRANGEMENT AROUND SAID DRIVE-WHEEL AND SAID PULLEY, A DRIVE LINKAGE WITHIN SAID TRACK CONNECTED TO SAID DOOR, MEANS CONNECTED TO SAID DOOR INDEPENDENTLY OF SAID MOTOR AND SAID SHAFT FOR COUNTERBALANCING THE
Claim 2
Dependent Claim
86 words
IN A DOOR OPERATOR, A DOOR, A TRACK FOR GUIDING SAID DOOR BETWEEN CLOSED AND OPEN POSITIONS, A MOTOR AND SHAFT, A DRIVE-WHEEL ON THE SHAFT AND A PULLEY SPACED FROM SAID DRIVE-WHEEL IN THE DIRECTION OF MOVEMENT OF SAID DOOR FOR CONFINING A CABLE WITHIN A DOOR-DRIVING RANGE, A CABLE IN ENDLESS BELT ARRANGEMENT AROUND SAID DRIVE-WHEEL AND SAID PULLEY, A DRIVE LINKAGE WITHIN SAID TRACK CONNECTED TO SAID DOOR, MEANS CONNECTED TO SAID DOOR INDEPENDENTLY OF SAID MOTOR AND SAID SHAFT FOR COUNTERBALANCING 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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |