US3823337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for an electric discharge tube
Assignee: US Philips Corp
•
Filing: 1973-05-25
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Granted: 1974-07-09
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Expires: 1993-05-25
Abstract
Abstract A cathode suitable for poor vacuum conditions and repeated exposures to air consists of a molybdenum support, compact or compressed powder, welded on a tungsten wire and having thereon a compressed mixture of rhenium with lanthanum hexaboride. Instead of rhenium, a tungsten boride such as W2B or W2B5 may be chosen.
Inventors
- 👤 N Mitra
- 👤 Stratum A Van
- 👤 P Zalm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:15
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/14; H01J1/148
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
37 words
AN ACYLATED TRIPEPTIDE OF THE FORMULA AND HAVING THEREON A COMPRESSED MIXTURE OF RHENIUM WITH CAC-PHE-ALA-PRO LANTHANUM HEXABORDIDE. INSTEAD OF RHENIUM, A TUNGSTEN BORIDE WHEREIN CAC IS CHLOROACETIC ACID; SUCH AS W2B OR W2B5 MAY BE CHOSEN.
Claim 2
Dependent Claim
37 words
AN ACYLATED TRIPEPTIDE OF THE FORMULA AND HAVING THEREON A COMPRESSED MIXTURE OF RHENIUM WITH CAC-PHE-ALA-PRO LANTHANUM HEXABORDIDE. INSTEAD OF RHENIUM, A TUNGSTEN BORIDE WHEREIN CAC IS CHLOROACETIC ACID; SUCH AS W2B OR W2B5 MAY BE CHOSEN.
Claim 3
Dependent Claim
8 words
A TETRAPEPTIDE OF THE FORMULA PGLU-TRP-ALA-PRO OR PGLU-LYS-TRP-ALA-PRO
Claim 4
Dependent Claim
8 words
A TETRAPEPTIDE OF THE FORMULA PGLU-TRP-ALA-PRO OR PGLU-LYS-TRP-ALA-PRO
Claim 5
Dependent Claim
18 words
A cathode as claimed in claim 1, characterized in that the tungsten boride consists of W2B or W2B5.
Claim 6
Dependent Claim
26 words
AN ACYLATED TETRAPEPTIDE OF THE FORMULA DAC-FLY-PHE-ALA-PRO- OR A-LYS-PHE-ALA-PRO WHEREIN DAC IS DIAZOACETIC ACID, AND A IS CHLOROACETIC ACID, CYCLOBUTYLCARBOXYLIC ACID, CYCLOPENTYLCARBOXYLIC ACID OR CYCLOHEXYLCARBOXYLIC ACID;
Claim 7
Dependent Claim
26 words
AN ACYLATED TETRAPEPTIDE OF THE FORMULA DAC-FLY-PHE-ALA-PRO- OR A-LYS-PHE-ALA-PRO WHEREIN DAC IS DIAZOACETIC ACID, AND A IS CHLOROACETIC ACID, CYCLOBUTYLCARBOXYLIC ACID, CYCLOPENTYLCARBOXYLIC ACID OR CYCLOHEXYLCARBOXYLIC ACID;
Claim 8
Dependent Claim
5 words
A PENTAPEPTIDE OF THE FORMULA
Claim 9
Dependent Claim
5 words
A PENTAPEPTIDE OF THE FORMULA
Claim 10
Dependent Claim
12 words
AN ACYLATED PENTAPEPTIDE OF THE FORMULA DAC-GLY-GLY-PHE-ALA-PRO WHEREIN DAC IS DIASOZOACETIC ACID;
Claim 11
Dependent Claim
12 words
AN ACYLATED PENTAPEPTIDE OF THE FORMULA DAC-GLY-GLY-PHE-ALA-PRO WHEREIN DAC IS DIASOZOACETIC ACID;
Claim 12
Dependent Claim
28 words
A HEXAPEPTIDE OF THE FORMULA PGLU-LYS-PHE-ALA-PRO-PRO; PGLU-K-TRP-PRO-ARG-PRO WHERE K IS ASN, NLE OR SER; PGLU-NLE-TRP-PRO-L-PRO WHEREIN L IS HIS OR GLY; PGLU-ASN-TRP-PRO-M-PRO WHEREIN M IS LYS OR GLY;
Claim 13
Dependent Claim
28 words
A HEXAPEPTIDE OF THE FORMULA PGLU-LYS-PHE-ALA-PRO-PRO; PGLU-K-TRP-PRO-ARG-PRO WHERE K IS ASN, NLE OR SER; PGLU-NLE-TRP-PRO-L-PRO WHEREIN L IS HIS OR GLY; PGLU-ASN-TRP-PRO-M-PRO WHEREIN M IS LYS OR GLY;
Claim 14
Dependent Claim
6 words
AN OCTAPEPTIDE OF THE FORMULA PGLU-ILE-PRO-PRO-LYS-PHE-ALA-PRO;
Claim 15
Dependent Claim
6 words
AN OCTAPEPTIDE OF THE FORMULA PGLU-ILE-PRO-PRO-LYS-PHE-ALA-PRO;
Claim 16
Dependent Claim
23 words
AN ACYLATED OCTAPEPTIDE OF THE FORMULA N-O-PRO-ARG-PRO-GLN-ILE-PRO-PRO WHEREIN N IS CYCLOBUTYLCARBOXYLIC ACID, CYCLOPENTYLCARBOXYLIC ACID IS OR CYCLOHEXYLCARBOXYLIC ACID AND O IS TRP, TYR,
Claim 17
Dependent Claim
23 words
AN ACYLATED OCTAPEPTIDE OF THE FORMULA N-O-PRO-ARG-PRO-GLN-ILE-PRO-PRO WHEREIN N IS CYCLOBUTYLCARBOXYLIC ACID, CYCLOPENTYLCARBOXYLIC ACID IS OR CYCLOHEXYLCARBOXYLIC ACID AND O IS TRP, TYR,
Claim 18
Dependent Claim
60 words
A NONAPEPTIDE OF THE FORMULA PGLUC-TRP-PRO---P-P-RO-Q-IIE-PRO-PRO WHEREIN P IS ARG, ARG, HIS, LYS OR GLY AND GLN OR ASN; PGLU-TRP-PRO-R-PR-S-T-ALA-PRO WHEREIN R IS ARG OR ORN, S IS NLW OR GLN AND T IS ILE OR PHE; PGLU-O-TRP-PRO-ORN-PRO-S-T-PRO-PRO WHEREIN S AND T ARE AS DEFINED ABOVE; PGLU-O-PRO-ARG-PRO-GLN-ILE-PRO-PRO WHEREIN O IS AS DEFINED ABOVE PGLU-TRP-PRO-ARG-PRO-GLN-NLE-T-PRO-PRO WHEREIN T IS AS DEFINED ABOVE;
Claim 19
Dependent Claim
60 words
A NONAPEPTIDE OF THE FORMULA PGLUC-TRP-PRO---P-P-RO-Q-IIE-PRO-PRO WHEREIN P IS ARG, ARG, HIS, LYS OR GLY AND GLN OR ASN; PGLU-TRP-PRO-R-PR-S-T-ALA-PRO WHEREIN R IS ARG OR ORN, S IS NLW OR GLN AND T IS ILE OR PHE; PGLU-O-TRP-PRO-ORN-PRO-S-T-PRO-PRO WHEREIN S AND T ARE AS DEFINED ABOVE; PGLU-O-PRO-ARG-PRO-GLN-ILE-PRO-PRO WHEREIN O IS AS DEFINED ABOVE PGLU-TRP-PRO-ARG-PRO-GLN-NLE-T-PRO-PRO WHEREIN T IS AS DEFINED ABOVE;
Claim 20
Dependent Claim
22 words
A DECAPEPTIDE OF THE FORMULA PGLU-K-TRP-PRO-P-PRO-Q-ILE-PRO-PRO; WHEREIM K, P AND Q ARE AS DEFINED ABOVE; PGLU-U-TRP-PRO-P-PRO-GLN-ILE-PRO-PRO WHEREIN U IS LYS OR GLU;
Claim 21
Dependent Claim
22 words
A DECAPEPTIDE OF THE FORMULA PGLU-K-TRP-PRO-P-PRO-Q-ILE-PRO-PRO; WHEREIM K, P AND Q ARE AS DEFINED ABOVE; PGLU-U-TRP-PRO-P-PRO-GLN-ILE-PRO-PRO WHEREIN U IS LYS OR GLU;
Claim 22
Dependent Claim
18 words
AN UNDECAPEPTIDE OF THE FORMULA PGLU-TRP-PRO-ARG-PROV-V-PRO-W-ILE-PRO-PRO WHEREIN V IS THR OR GLY AND W IS GLN OR GLU;
Claim 23
Dependent Claim
18 words
AN UNDECAPEPTIDE OF THE FORMULA PGLU-TRP-PRO-ARG-PROV-V-PRO-W-ILE-PRO-PRO WHEREIN V IS THR OR GLY AND W IS GLN OR GLU;
Claim 24
Dependent Claim
6 words
A TRIDECAPEPTIDE OF THE FORMULA PGLU-GLY-GLY-TRP-PRO-ARG-PRO-GLY-PRO-W-ILEPRO-PRO
Claim 25
Dependent Claim
6 words
A TRIDECAPEPTIDE OF THE FORMULA PGLU-GLY-GLY-TRP-PRO-ARG-PRO-GLY-PRO-W-ILEPRO-PRO
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |