US3698561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering pipette
Assignee: Warner Lambert Co LLC
•
Filing: 1971-05-12
•
Granted: 1972-10-17
•
Expires: 1991-05-12
Abstract
Abstract Pipette of resilient material is made of two interlocking parts which taper down at their opposite ends to a narrow opening. A filter disc of a suitable material is held in position between the interlocking parts. Liquid which is drawn into the pipette through one end passes through the filter disc before being discharged in filtered form at the other end.
Inventors
- 👤 Arthur L Babson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:19
CPC Classifications
B; B01; B01D; B01D35/00; B01L; B01L3/00; B01L3/02; B01L3/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A filtering pipette comprising a first section consisting of a resilient cylindrical body, said body being tapered at one end to form a narrow opening, a second section comprising a generally cylindrical cap tapered at one end to form a narrow opening, adapted at its other end to be separably attached to said tapered cylindrical body at its opposite end, seating means formed between said sections when attached, a filter disc mounted in said seat and held in position by the cooperative action of the separable sections the resilience of said cylindrical body being sufficient that liquid may be drawn thereinto through the submerged cap opening and said filter disc by the vacuum created as the cylindrical body returns to its original shape after being collapsed by finger pressure and thereafter the resulting filtered liquid may be discharged through the narrow opening in said cylindrical body when it is inverted and again collapsed by finger pressure.
Claim 2
Dependent Claim
156 words
A filtering pipette comprising a first section consisting of a resilient cylindrical body, said body being tapered at one end to form a narrow opening, a second section comprising a generally cylindrical cap tapered at one end to form a narrow opening, adapted at its other end to be separably attached to said tapered cylindrical body at its opposite end, seating means formed between said sections when attached, a filter disc mounted in said seat and held in position by the cooperative action of the separable sections the resilience of said cylindrical body being sufficient that liquid may be drawn thereinto through the submerged cap opening and said filter disc by the vacuum created as the cylindrical body returns to its original shape after being collapsed by finger pressure and thereafter the resulting filtered liquid may be discharged through the narrow opening in said cylindrical body when it is inverted and again collapsed by finger pressure.
Claim 3
Dependent Claim
31 words
A filtering pipette in accordance with claim 1 wherein the two sections are separably attached by the cooperative action of a circumferential bead and an annular groove provided in said sections.
Claim 4
Dependent Claim
48 words
A filtering pipette in accordance with claim 1 wherein a portion of said generally cylindrical cap tapers down to form a narrow opening and another portion of said cap comprises a wall surrounding said narrow opening and forming an annular space between said wall and said narrow opening.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |