US4157835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strip seal for stuffing box packing
Assignee: Individual
•
Filing: 1978-01-06
•
Granted: 1979-06-12
•
Expires: 1998-01-06
Abstract
Abstract A graphite containing strip seal for stuffing box packing made of graphite with a maximum modulus of elasticity of 2000 N/mm 2 , with the strip seals having patterns of raised areas and indentations along at least one surface thereof such that when the strip is coiled there is no mating of the raised areas and the grooves.
Inventors
- 👤 Otto Kahle
- 👤 Gunter Reichow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:22
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; F16J15/22; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A graphite containing strip seal for stuffing box packing designed to be sealingly coiled in layers about a rotatable shaft, said graphite having a maximum modulus of elasticity of 2000 N/mm 2 , comprising: an upper and a lower surface with at least one of said surfaces having a plurality of raised areas and indentations such that when the strip is coiled the raised areas of one surface do not rest in the indentations of an abutting surface.
Claim 2
Dependent Claim
78 words
A graphite containing strip seal for stuffing box packing designed to be sealingly coiled in layers about a rotatable shaft, said graphite having a maximum modulus of elasticity of 2000 N/mm 2 , comprising: an upper and a lower surface with at least one of said surfaces having a plurality of raised areas and indentations such that when the strip is coiled the raised areas of one surface do not rest in the indentations of an abutting surface.
Claim 3
Dependent Claim
25 words
The seal according to claim 1 in which the average width of the indentation does not exceed five times the maximum thickness of the strip.
Claim 4
Dependent Claim
25 words
The seal according to claim 1 in which the average width of the indentation does not exceed three times the maximum thickness of the strip.
Claim 5
Dependent Claim
23 words
The strip seal according to claim 1 in which the indentations form grooves which extend substantially along the longitudinal orientation of the strip.
Claim 6
Dependent Claim
33 words
The strip seal according to claim 1 in which the width of the indentations does not exceed twice the distance between the bottom of the indentation and the top of the raised area.
Claim 7
Dependent Claim
22 words
The strip seal according to claim 1 in which open areas remain within the coiled material after axial compression of the seal.
Claim 8
Dependent Claim
23 words
The strip seal according to claim 6 in which the elastic recovery after axial compression at 15 Kgf/cm 2 is at least 3%.
Claim 9
Dependent Claim
22 words
The strip seal according to claim 6 in which the elastic recovery after compression at 20 Kgf/cm 2 is at least 5%.
References Cited (Backward Citations)
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US1543963A
Cited
US1532961A
Cited
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Cited
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Cited
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Cited
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Cited
US4068853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |