US3667513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generation of alkali metal vapors
Assignee: SAES Getters SpA
•
Filing: 1970-05-20
•
Granted: 1972-06-06
•
Expires: 1990-05-20
Abstract
Abstract An alkali metal generator comprising: an evacuated container; at least one heat-responsive source of an alkali metal vapor in the container; a closed conduit for connecting the evacuated container to a vessel to be charged with the alkali metal vapor; and means for opening said closed conduit. The container can also have a getter device.
Inventors
- 👤 Paolo Della Porta
- 👤 Mario Zucchinelli
- 👤 Carlo Emili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:10
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
59 words
An alkali metal generator comprising: A. an evacuated container; B. at least one heat-responsive source of an alkali metal vapor in the container; C. a closed conduit for connecting the evacuated container to a vessel to be charged with the alkali metal vapor; D. means for opening said closed conduit; and E. a non-evaporable getter device in the container.
Claim 2
Dependent Claim
15 words
a mixture of cesium chromate and a reducing agent for the chromate within the tube;
Claim 3
Dependent Claim
14 words
a mixtured potassium chromate and a reducing agent for the chromate within the tube;
Claim 4
Dependent Claim
14 words
a mixtured sodium chromate and a reducing agent for the chromate within the tube;
Claim 5
Dependent Claim
128 words
an inductively heatable metal member in said groove in contact with the walls of the groove; G. a getter device in the form of a pleated substrate having imbedded in its surface a particulate non-evaporable getter metal, said pleated strip being in said container between the alkali metal releasing devices and the conduit; whereby the open end of the conduit can be attached to a vessel to be charged with alkali metal vapors followed by induction heating of said metal member causing breaking of the elongated glass member, whereby subsequent passage of current through each of the tubes causes release of alkali metal vapor which is scrubbed of noxious gases by the non-evaporable getter metal and then passes through the conduit and into the vessel to be charged.
Claim 6
Dependent Claim
10 words
two terminals one attached to each end of the tube;
Claim 7
Dependent Claim
10 words
two terminals one attached to each end of the tube;
Claim 8
Dependent Claim
10 words
two terminals one attached to each end of the tube;
Claim 9
Dependent Claim
61 words
An alkali metal generator comprising: A. an evacuated container; B. at least one heat-responsive source of an alkali metal vapor in the container; C. a conduit for connecting the evacuated container to a vessel to be charged with the alkali metal vapor; and D. a nipple closing said conduit and having means responsive to an inductive field for breaking the nipple.
Claim 10
Dependent Claim
27 words
means for impressing an electrical potential across the terminals to pass a current through the tube; C. a potassium releasing device within the container, said device comprising:
Claim 11
Dependent Claim
27 words
means for impressing an electrical potential across the terminals to pass a current through the tube; D. a sodium releasing device within the container, said device comprising;
Claim 12
Dependent Claim
66 words
means for impressing an electrical potential across the terminals to pass a current through the tube; E. a glass conduit open on one end and attached to the container walls on the other end; F. a hollow elongated glass member open to the interior of the container on one end and closed on the other end, said member extending into said conduit and closing said conduit;
Claim 13
Dependent Claim
77 words
An alkali metal generator comprising: A. an evacuated container; B. at least one heat-responsive source of an alkali metal vapor in the container; C. a conduit for connecting the evacuated container to vessel to be charged with the alkali metal vapor; D. a nipple closing said conduit and having means responsive to an inductive field for breaking the nipple; and E. a non-evaporable getter device in the container between the conduit and the alkali metal vapor source.
Claim 14
Dependent Claim
102 words
An alkali metal generator comprising: A. an evacuated container; B. at least one heat-responsive source of an alkali metal vapor in the container; C. a conduit for connecting the evacuated container to a vessel to be charged with the alkali metal of vapor; D. a nipple closing said conduit and having a groove in the outside wall of the nipple and an inductively heatable metal member in said groove; and E. a non-evaporable getter device in the container wherein the getter metal of the getter device is disposed in an optically opaque manner between the conduit and the alkali metal vapor source.
Claim 15
Dependent Claim
25 words
The alkali metal generator of claim 1 wherein there are three alkali metal vapor sources one of cesium, one of potassium, and one of sodium.
Claim 16
Dependent Claim
21 words
The alkali metal generator of claim 1 wherein the evacuated container is evacuated to an absolute pressure of 10 7 torr.
Claim 17
Dependent Claim
21 words
The alkali metal generator of claim 1 wherein the evacuated container is evacuated to an absolute pressure of 10 9 torr.
Claim 18
Dependent Claim
29 words
The alkali metal generator of claim 1 wherein the source of alkali metal vapor is a mixture of an alkali metal chromate and a reducing agent for the chromate.
Claim 19
Dependent Claim
15 words
The alkali metal generator of claim 9 wherein the reducing agent is a zirconium-aluminum alloy.
Claim 20
Dependent Claim
22 words
Alkali metal generator of claim 2 wherein the getter device employs an alloy of zirconium and aluminum as its non-evaporable getter metal.
Claim 21
Dependent Claim
15 words
The alkali metal generator of claim 11 wherein the alloy contains 84 percent zirconium-balance aluminum.
Claim 22
Dependent Claim
35 words
An alkali metal generator for releasing cesium, potassium, and sodium, said generator comprising: A. a glass container evacuated to at least 10 7 torr; B. a cesium releasing device within the container, said device comprising:
References Cited (Backward Citations)
US2757840A
Cited
US3484146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |