Patent US3091947A successfully refreshed from Google Patents.
US3091947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double unit spiral spring drive
Assignee: Individual
•
Filing: 1960-08-08
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Granted: 1963-06-04
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Expires: 1980-08-08
Abstract
No abstract record available.
Inventors
- 👤 Howard J Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:02
CPC Classifications
B; B21; B21F; B21F3/00; F; F16; F16D; F16D3/00; F16D3/50; F16D3/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A SPRING DRIVE INCLUDING A SPRING INTERCONNECTING A PAIR OF SUBSTANTIALLY ALIGNED SHAFTS, SAID SPRING COMPRISING A PAIR OF ADJACENT SPIRALLY WOUND UNITS CONTAINING A PLURALITY OF TURNS JOINED BY AN OUTER TURN DIAGONALLY DISPOSED THEREACROSS, THE ENDS OF THE SPRING BEING DISPOSED AT THE CENTER OF THE UNITS, SAID PAIR OF SUBSTANTIALLY ALIGNED SHAFTS HAVING ADJACENT ENDS SECURED TO THE ENDS OF SAID UNITS.
Claim 2
Dependent Claim
65 words
A SPRING DRIVE INCLUDING A SPRING INTERCONNECTING A PAIR OF SUBSTANTIALLY ALIGNED SHAFTS, SAID SPRING COMPRISING A PAIR OF ADJACENT SPIRALLY WOUND UNITS CONTAINING A PLURALITY OF TURNS JOINED BY AN OUTER TURN DIAGONALLY DISPOSED THEREACROSS, THE ENDS OF THE SPRING BEING DISPOSED AT THE CENTER OF THE UNITS, SAID PAIR OF SUBSTANTIALLY ALIGNED SHAFTS HAVING ADJACENT ENDS SECURED TO THE ENDS OF SAID UNITS.
References Cited (Backward Citations)
US1804705A
Cited
FR570987A
Cited
US1897412A
Cited
US1917486A
Cited
US2754580A
Cited
US2821379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |