Patent US3720836A successfully refreshed from Google Patents.
US3720836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection from laser radiation
Assignee: Sigri Elektrographit dt GmbH
•
Filing: 1971-03-12
•
Granted: 1973-03-13
•
Expires: 1991-03-12
Abstract
Abstract For protection from laser radiation, a shielding material composed of a sheaf of fabric-like, flexible graphite foils is placed between the radiation source and the object to be shielded.
Inventors
- 👤 E Donges
- 👤 F Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:51
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/064; B23K26/066; B23K26/0661; A; A61; A61B; A61B90/00; A61B90/04; A61F; A61F9/00; A61F9/02; A61F9/022; B23K26/70; B23K26/702; B23K26/706; B23K37/00; B23K37/006; A61B2090/049
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
The method of protecting from laser radiation, which comprises shielding a laser-radiation exposed object by interposing, between the laser source and the object, a fabric-like shielding material composed of flexible graphite foils.
Claim 2
Independent Claim
32 words
The method of protecting from laser radiation, which comprises shielding a laser-radiation exposed object by interposing, between the laser source and the object, a fabric-like shielding material composed of flexible graphite foils.
Claim 3
Independent Claim
34 words
The method of protecting from laser radiation, which comprises enveloping a laser-radiation exposed object in a flexible composite envelope material consisting essentially of a fabric composed of an assembly of substantially parallel graphite foils.
Claim 4
Independent Claim
34 words
The method of protecting from laser radiation, which comprises enveloping a laser-radiation exposed object in a flexible composite envelope material consisting essentially of a fabric composed of an assembly of substantially parallel graphite foils.
Claim 5
Independent Claim
49 words
The method of working a workpiece by laser irradiation, which comprises covering the laser-radiation exposed surface of the workpiece with a perforated shielding material composed of flexible graphite foils which extend substantially parallel to the workpiece surface; and irradiating the covered workpiece through the perforation of the shielding material.
Claim 6
Independent Claim
49 words
The method of working a workpiece by laser irradiation, which comprises covering the laser-radiation exposed surface of the workpiece with a perforated shielding material composed of flexible graphite foils which extend substantially parallel to the workpiece surface; and irradiating the covered workpiece through the perforation of the shielding material.
Claim 7
Dependent Claim
31 words
A shielding material for protection from laser radiation, consisting substantially of a sheaf of flexible graphite foils arranged in layers transverse to the direction of laser radiation and substantially impermeable thereto.
Claim 8
Dependent Claim
31 words
A shielding material for protection from laser radiation, consisting substantially of a sheaf of flexible graphite foils arranged in layers transverse to the direction of laser radiation and substantially impermeable thereto.
Claim 9
Dependent Claim
33 words
In a laser-radiation shielding material according to claim 4, said sheaf having at least one perforation and, when in operation, being placed on top of a workpiece to be laser-processed through the perforation.
Claim 10
Dependent Claim
20 words
In a laser-radiation shielding material according to claim 4, said flexible foils consisting of binder-free, compressed and expanded graphite material.
Claim 11
Dependent Claim
20 words
In a laser-radiation shielding material according to claim 6, said flexible graphite foils being reinforced by embedded fibers of graphite.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |