US3657993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coffee brewer
Assignee: Individual
•
Filing: 1970-10-15
•
Granted: 1972-04-25
•
Expires: 1990-10-15
Abstract
Abstract An improved plunger-type coffee brewer in which the pistonplunger incorporates spring means for packing the coffee in the plunger with a predetermined density irrespective of the amount of coffee loaded in the plunger, and in which an improved plunger seal is provided.
Inventors
- 👤 Edward S Close
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:42
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/18; A47J31/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A coffee brewer, comprising, in combination: a container having an internal bore; and a coffee-carrying plunger assembly adapted to be reciprocable within said bore of said container, said plunger including first and second plate means each having a plurality of strainer holes, and spring means urging said plate means toward each other to uniformly compress a load of coffee grounds carried between said plate means.
Claim 2
Dependent Claim
65 words
A coffee brewer, comprising, in combination: a container having an internal bore; and a coffee-carrying plunger assembly adapted to be reciprocable within said bore of said container, said plunger including first and second plate means each having a plurality of strainer holes, and spring means urging said plate means toward each other to uniformly compress a load of coffee grounds carried between said plate means.
Claim 3
Dependent Claim
26 words
A coffee brewer according to claim 1 in which said first plate means comprises the bottom of a cup means adapted to hold said coffee grounds.
Claim 4
Dependent Claim
39 words
A coffee brewer according to claim 2 having lid means attachable to said cup means, said spring means being attached to said lid means and arranged to urge said second plate means toward said bottom of said cup means.
Claim 5
Dependent Claim
78 words
A coffee brewer according to claim 1 in which said plunger includes a cup means having a bottom portion forming said first plate means, a lid attachable to said cup means, a plunger rod extending from one side of said lid, said spring means extending from the other side of said lid and one end of said spring means being attached to said lid, said second plate means being attached to the other end of said spring means.
Claim 6
Dependent Claim
17 words
A coffee brewer according to claim 1 in which said spring means comprises a helical compression spring.
Claim 7
Dependent Claim
36 words
A coffee brewer according to claim 1 in which said plunger includes a cylindrical cup means, and a flexible seal band surrounding said cylindrical cup means, said seal band having a pair of overlapping end portions.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |