US4052233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for gas-and fluid-tight sealing of boreholes which are threadless and under pressure, and are mounted in a hardenable raw material
Assignee: Langen and Co
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Filing: 1976-02-26
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Granted: 1977-10-04
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Expires: 1996-02-26
Abstract
Abstract A method of sealing non-threaded boreholes with a preferably spherical sealing member comprising pressing the sealing member into the borehole in an unhardened raw material hardenable by nitridation, wedging the lip of the borehole and hardening the material by nitridation at a temperature at which at least some of the initial stress generated by the pressing is retained.
Inventors
- 👤 Gunther Strauff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/13; F16J; F16J13/00; F16J13/02; F16J13/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A method for gas- and fluid-tight sealing of non-threaded boreholes in a nitridation hardenable raw material comprising the steps of: press fitting a hardened sealing member into a borehole in an unhardened raw material hardenable by nitridation; and hardening said raw material by nitridation at a temperature in which the initial stress which is developed by the pressing is partially retained.
Claim 2
Independent Claim
61 words
A method for gas- and fluid-tight sealing of non-threaded boreholes in a nitridation hardenable raw material comprising the steps of: press fitting a hardened sealing member into a borehole in an unhardened raw material hardenable by nitridation; and hardening said raw material by nitridation at a temperature in which the initial stress which is developed by the pressing is partially retained.
Claim 3
Dependent Claim
19 words
The method of claim 1 comprising the additional step of wedging the lip of said borehole prior to hardening.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the temperature is between 500° and 600° C.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein the temperature is between 500° and 600° C.
References Cited (Backward Citations)
US1918895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |