US4724020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for jointing ceramic elements
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1986-08-27
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Granted: 1988-02-09
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Expires: 2006-08-27
Abstract
Abstract A method for jointing ceramic elements is disclosed. Ceramic elements to be joined are arranged between a pair of torces each having a nozzle for spouting combustion gas. The joint line of ceramic elements is first heated by flames of combustion gas spouted from each nozzle and, then, a high voltage is applied between said pair of torches. Ceramic elements are joined by said heating and applying a high voltage between torches.
Inventors
- 👤 Yoshihiro Ebata
- 👤 Masanori Kohyama
- 👤 Nobuyuki Tamari
- 👤 Makoto Kinoshita
- 👤 Ryozo Hayami
- 👤 Susumu Mori
- 👤 Masahiko Nozawa
- 👤 Tokuzo Nishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:21
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B37/001; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/062; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/36; C04B2237/368; C04B2237/50; C04B2237/70; C04B2237/704; C04B2237/76
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A method for jointing ceramic elements being comprised of steps as follows; a step for contacting joint faces of ceramic elements to each other, a step for positioning said ceramic elements between at least one pair of torches being arranged apart from each other and oppositely each of which is made of an electrically conductive material and has a nozzle for spouting combustion gases at one end opposed to the other torch, a step for heating at least a portion of joint line defined by said joint faces on both sides thereof with flames being spouted from said nozzles, and a step for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches.
Claim 2
Independent Claim
118 words
A method for jointing ceramic elements being comprised of steps as follows; a step for contacting joint faces of ceramic elements to each other, a step for positioning said ceramic elements between at least one pair of torches being arranged apart from each other and oppositely each of which is made of an electrically conductive material and has a nozzle for spouting combustion gases at one end opposed to the other torch, a step for heating at least a portion of joint line defined by said joint faces on both sides thereof with flames being spouted from said nozzles, and a step for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein at least one of said ceramic elements shows an electrical conductivity when heated to a predetermined temperature.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein said voltage applied between said pair of torches is an alternate current voltage.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein said voltage applied between a pair of torches is a direct current voltage.
Claim 6
Independent Claim
136 words
A method for jointing ceramic elements being comprised of steps as follows; a step for contacting joint faces of ceramic elements to each other interposing adhesive material therebetween, said adhesive material showing an electrical conductivity when heated to a predetermined temperature, a step for positioning said ceramic elements between at least one pair of torches being arranged apart from each other and oppositely each of which is made of an electrically conductive material and has a nozzle for spouting combustion gas at one end opposed to the other torch, a step for heating at least a portion of joint line defined by said contacted joint faces on both sides thereof with flames being spouted from said nozzles, and a step for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches.
Claim 7
Independent Claim
136 words
A method for jointing ceramic elements being comprised of steps as follows; a step for contacting joint faces of ceramic elements to each other interposing adhesive material therebetween, said adhesive material showing an electrical conductivity when heated to a predetermined temperature, a step for positioning said ceramic elements between at least one pair of torches being arranged apart from each other and oppositely each of which is made of an electrically conductive material and has a nozzle for spouting combustion gas at one end opposed to the other torch, a step for heating at least a portion of joint line defined by said contacted joint faces on both sides thereof with flames being spouted from said nozzles, and a step for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches.
Claim 8
Independent Claim
129 words
An apparatus for jointing ceramic elements at high temperatures being comprised of at least one pair of torches which generate high-temperatures being arranged apart and in a direct line opposite from each other, each of which is made of an electrically conductive material and has a nozzle for spouting combusting gas at one end opposed to an in the direction of the other torch, a power source for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches in order to generate an electrical discharge between said nozzles, and a control circuit for controlling an output current of said power source to a predetermined value from the time that portions of the ceramic elements exposed to flames have been heated to a predetermined temperature.
Claim 9
Independent Claim
129 words
An apparatus for jointing ceramic elements at high temperatures being comprised of at least one pair of torches which generate high-temperatures being arranged apart and in a direct line opposite from each other, each of which is made of an electrically conductive material and has a nozzle for spouting combusting gas at one end opposed to an in the direction of the other torch, a power source for applying a high voltage of from 1,000 to 10,000 (volts) between said pair of torches in order to generate an electrical discharge between said nozzles, and a control circuit for controlling an output current of said power source to a predetermined value from the time that portions of the ceramic elements exposed to flames have been heated to a predetermined temperature.
Claim 10
Dependent Claim
16 words
Apparatus as described in claim 6 wherein said torches generate temperatures of at least 800° C.
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) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |