Patent US3724990A successfully refreshed from Google Patents.
US3724990A
Expired / Lapsed
US
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Photoflash lamp
Assignee: General Electric Co
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Filing: 1971-11-15
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Granted: 1973-04-03
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Expires: 1991-11-15
Abstract
Abstract A percussion-ignitable type flashlamp is disclosed which includes an improved primer material that is more stable in handling during lamp manufacture and improves performance of the lamp in operation. Said primer material comprises a mixture in percentages by weight of 4-50 percent phosphorus, 10-25 percent potassium chlorate, 4-10 percent sodium chlorate, and the remainder being titanium, which mixture can be bonded to form a unitary mass with a polyvinyl alcohol binder. A slurry of the primer material in an aqueous solution of 87-89 percent hydrolyzed polyvinyl alcohol remains substantially gel-free for long time periods and provides a tough and adherent coating in the lamp.
Inventors
- 👤 L Schupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:04
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023; F21K5/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
A flashlamp as in claim 1 wherein the combined weight percent of potassium chlorate and sodium chlorate does not exceed 25 percent.
Claim 2
Dependent Claim
21 words
A flashlamp as in claim 1 wherein the primer material is bonded into a unitary mass with a polyvinyl alcohol binder.
Claim 3
Dependent Claim
115 words
A flashlamp comprising a hermetically sealed light-transmitting envelope, a quantity of filamentary combustible material loosely distributed within said envelope, a filling of a combustion-supporting gas in said envelope, and a percussive-ignition system for said lamp comprising a readily deformable metal ignition tube sealed in and projecting from one end of said envelope enclosed off at its outer end, a wire anvil of a high temperature resistant and low thermal-conducting material disposed within and substantially coaxially with said ignition tube, said wire anvil being coated with a quantity of primer material which comprises a mixture in percentages by weight of 4-50 percent phosphorus, 10-25 percent potassium chlorate, 4-10 percent sodium chlorate, and the remainder being titanium.
Claim 4
Dependent Claim
22 words
A flashlamp as in claim 4 wherein the combined weight percent of potassium cHlorate and sodium chlorate does not exceed 25 percent.
Claim 5
Dependent Claim
22 words
A flashlamp as in claim 4 wherein the coating of primer material is bonded to the anvil with a polyvinyl alcohol binder.
Claim 6
Dependent Claim
18 words
A flashlamp as in claim 6 wherein the polyvinyl alcohol binder is approximately 87-89 percent hydrolyzed polyvinyl alcohol.
Claim 7
Dependent Claim
41 words
A primer material which comprises a solid mixture having in percentages by weight 4-50 percent phosphorus, 10-25 percent potassium chlorate, 4-10 percent sodium chlorate, and the remainder being titanium which is bonded into a unitary mass with a polyvinyl alcohol binder.
Claim 8
Dependent Claim
48 words
A stabilized slurry of primer material which comprises a solid mixture containing in percentages by weight of said solid mixture 4-50 percent phosphorus, 10-25 percent potassium chlorate, 4-10 percent sodium chlorate, and the remainder being titanium with said mixture being suspended in an aqueous solution of polyvinyl alcohol.
Claim 9
Dependent Claim
16 words
A stabilized slurry as in claim 9 wherein the polyvinyl alcohol is approximately 87-89 percent hydrolyzed.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |