Patent US3105494A successfully refreshed from Google Patents.
US3105494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring binder
Assignee: Duncan Research
•
Filing: 1960-09-23
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Granted: 1963-10-01
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 James K Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:08
CPC Classifications
B; B42; B42F; B42F13/00; B42F13/16; B42F13/20; B42F13/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A RING BINDER COMPRISING: A PAIR OF ELONGATED MEMBERS, SPACED FROM EACH OTHER AND POSITIONED GENERALLY PARALLEL TO EACH OTHER; A PLURALITY OF SPLIT RINGS EXTENDING BETWEEN SAID MEMBERS; AND MEANS INCLUDING A PAIR OF DIAPHRAGMS INTERCONNECTING SAID MEMBERS, SAID DIAPHRAGMS BEING MOVABLE ACROSS CENTER TO PIVOT SAID TWO
Claim 2
Dependent Claim
49 words
A RING BINDER COMPRISING: A PAIR OF ELONGATED MEMBERS, SPACED FROM EACH OTHER AND POSITIONED GENERALLY PARALLEL TO EACH OTHER; A PLURALITY OF SPLIT RINGS EXTENDING BETWEEN SAID MEMBERS; AND MEANS INCLUDING A PAIR OF DIAPHRAGMS INTERCONNECTING SAID MEMBERS, SAID DIAPHRAGMS BEING MOVABLE ACROSS CENTER TO PIVOT SAID TWO
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |