US3342634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing black, metalcontaining surface layers
Assignee: US Philips Corp
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Filing: 1963-10-14
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Granted: 1967-09-19
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Provisor Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:46
CPC Classifications
H; H01; H01J; H01J19/00; C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; C23C18/125; C23C18/1275; C23C22/00; C23C22/73; C23C22/74; C23C22/82; C23C22/84; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26; H01J19/28; H01J19/32; H01J19/36; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0023; H01J2893/0027
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A METHOD OF FORMING A BLACK SURFACE LAYER ON A METAL SUBSTRATE COMPRISING THE STEPS OF APPLYING A LAYER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MOLYBDATES AND TUNGSTATES OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF LI, NA, K, RB, AND CS, TO AT LEAST A PORTION OF THE SURFACE OF SAID SUBSTRATE, AND HEATING SAID SURFACE LAYER IN A REDUCING ATMOSPHERE TO A TEMPERATURE OF ABOUT 600*C. TO CONVERT SAID LAYER TO A BLACK SURFACE LAYER CONSISTING OF AN OXIDE COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM AND TUNGSTEN AND ONE OF SAID ELEMENTS.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |