US4047872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device on pressing piston
Assignee: Individual
•
Filing: 1975-03-07
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Granted: 1977-09-13
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Expires: 1995-03-07
Abstract
Abstract A device for compressing a wax-type material comprising a piston disposed within a chamber wherein channels are provided along the lateral surface of the piston for venting gases during the compressing operation.
Inventors
- 👤 Hugo Karlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:00
CPC Classifications
C; C11; C11C; C11C5/00; C11C5/02; C11C5/021; Y; Y10; Y10S; Y10S100/00; Y10S100/903; Y10S100/906; Y10S425/00; Y10S425/803
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
123 words
A device for compressing a wax-type material which comprises a chamber containing a piston movably disposed therein, at least a portion of the lateral surface of said piston containing a plurality of projecting members which extend from said lateral surface into sliding engagement with the wall of said chamber, said projecting member defining a plurality of channels therebetween for venting of gases produced during the compressing operation, wherein said piston is provided with a head portion containing a skirt having a continuous surface and said continuous surface of said skirt being provided with said projecting members, and said projecting members are arranged in a plurality of substantially parallel rows, with the projecting members in adjacent rows being staggered with respect to each other.
Claim 2
Independent Claim
123 words
A device for compressing a wax-type material which comprises a chamber containing a piston movably disposed therein, at least a portion of the lateral surface of said piston containing a plurality of projecting members which extend from said lateral surface into sliding engagement with the wall of said chamber, said projecting member defining a plurality of channels therebetween for venting of gases produced during the compressing operation, wherein said piston is provided with a head portion containing a skirt having a continuous surface and said continuous surface of said skirt being provided with said projecting members, and said projecting members are arranged in a plurality of substantially parallel rows, with the projecting members in adjacent rows being staggered with respect to each other.
Claim 3
Dependent Claim
12 words
The device of claim 1, wherein said projecting members are rubber plugs.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |